I can only speak as a relatively affluent white male who grew up in an urban environment. Here are a few points of wisdom.

You already noticed that high-school is a weird purgatory on the Journey to becoming a real person. This is excellent insight and realizing it is the first step to getting out of the box. The reason for this is because kids in high-school are looking for relevance in the world that finds you to be an annoying liability. That's why all sorts of weird things matter in high school that nobody gives a shit about in the real world.

Knowing that, How do you get out? Well...

You need a car. The sooner you get a car the more freedom you have to do shit that matters. In America with the exception of a few select cities one cannot be an independent person without one. This is especially true if you live in the burbs.

You don't have any cash but you want a car, how do you get a car? You need at least 2-2.5k for the most basic set of wheels. So go out there and get work. Since you are 15 the only people that will hire you are sketchy ass restaurants as a dishwasher or fry cook. You could do that for $6-8.50 /hr or you could go visit your neighbors knock on their door and offer to mow their lawn for $10-$15 and help with yard labor. Offer to paint, weed, dog walk, babysit, any general help, print out flyers with your name picture and what you are willing to do.

Right now for example its a good time to Aerate, Seed and fertilize lawns. You can rent the equipment to do it for about $70/day. You can also charge about $50-70 per lawn for the service. If you get multiple people lined up in the same day you could do about 4-6 lawns a day. Hard work but good money. Seeding is obviously extra maybe $25-30 + material. Fertilizing same deal. You can even do better by renting the equipment on Saturday evening and returning it Monday morning giving you a few extra hours to work with. Great thing about doing something like that is you get people to buy into the main service and then you can offer them lawn mowing services (and maybe snow removal services) that pay a bit less but are steady income and less labor intensive.

In most states you cant drive till 16 anyway so you have a year to earn your wheels. That should keep you busy and bring some relevance to your life.

Also 15 is a fine ripe age to start chasing skirt and getting laid. You asked about those unique high school experiences... well this is it. Women will never be as un-jaded and inexperienced as they are now. That means you can get away with making all sorts of mis-steps and still have success. If you aren't already doing so need to start asking girls out. Will you get rejected? Hell yes you will. Thats normal, once you've been rejected about 100 you will just laugh it off and it wont matter much. Thats the point you want to get to. Getting rejected is a life skill that you will need to learn (if you are doing the above and looking for work you will already have lots of practice with rejection).

My advice for starting out is to avoid girls that are "Cool" find girls in the "out" crowd they are searching for relevance just like you are. Asking them out will make them feel more relevant, also you are more likely to get what you want wink wink . If you can stand the stigma from your friends date a chubby chick for your first, its easier. I compare it to riding a bicycle with training wheels. Its just easier and helps build confidence to move on to hotter chicks. Your friends will tease your mercilessly but you can just remind them that at least you are getting some and they are still hanging out on p0rnhub. There is a well documented phenomenon where men who are dating other women are more desirable and you will be gaining valuable experience (dealing with women as a man is an acquired skill).

Go ahead and read "The Game". Age 15 is probably about the age group its written for. Know that the author took some liberties with reality but that there are some useful and empowering ideas there. It may totally corrupt you way of thinking, or it might not make any sense, not sure it opened up new avenues of thinking for me but im sure I'll get a lot of hate for it. Trying some of the things written in in and finding out that they don't actually work but that things didn't end up going as spectacularly bad as I thought they might was and integral part of my learning experience.

At this age I had all these odd Disney ideas of being a white Knight nice guy etc, taking them on dates just to "hang out", making that perfect connection for "True love". It was all self defeating bullshit. IMO If you are just honest with yourself that your are young horndog and what you want is to make out, have sex and experiment then you will be way better off. You will find that there are lots of women who want the same thing. You just need to learn how to ask in a socially acceptable way (that's were practice and experience come in). As for love, you will find it or it will find you. If you date enough people it eventually just kind of happens (although especially early on there will be lots of false positives).

Don't just focus on women, or at least make doing "Interesting" stuff part of your "Game" plan. Now's a great time to learn to Ski, Board, Surf, Rock Climb, Guitar, Mountain bike, fish, hunt, Sail, Soccer, Basketball, golf, softball, etc what ever strikes your fancy. When you get older you wont have time to devote to learning this stuff from scratch but its easy to maintain. They can be your after work activity and social group. You may never hit "Pro" level but you will find that even a basic level will open all sorts of social doors and allows you to have personal creative outlets.

As for doing well in school, it matters to a point. Make sure you get the bare minimum to get where you want to go college wise, beyond that it doesent really matter much if you have a 3.6Gpa or 4.0 unless you want to go to a top tier undergrad school, and even that is probably a waste of money. Keep in mind college isnt a sure bet there are a few paths that you can take that will improve your earning potential, but also lots of holes to fall into that will just put you 100k in debt working in a coffee shop. If you don't have a good alternate plan go ahead and go to a cheap college (In state tuition). If you treat college as a career prep instead of just a place to hang out and get drunk/high you will do fine. Also its ok to get drunk and high, just know your limit.

Thats my advice... Ignore it if you want.. If you got questions feel free to ask. You didnt give me much on who you are that may change opportunities for you. If you want to give more info maybe I can tailor my advice better. Otherwise I just assumed you were 15 your old me :)