If there are high schoolers reading this:
Get you school work done and then get out. Like, leave the house and go outside. Find friends, see things, get lost, and come back in time to be prepared to take on the next day.
Read a fucking book. Get yourself in discussions and debates with people. Learn to not be an asshole. Do things you're not comfortable with. Get laid.
Do what you have to do, and then go do what you want to do, whether you know its something you like or not. Anything you try that you don't like, recognize why you don't like it, and don't do it again. Don't be afraid to move from a friend group to another if your friends turn out to be toxic. That might happen a lot, it's OK.