My high school promised each senior $50 if we walked and then participated in some sort of goodbye event that lasted 'til 6am the next morning. So we walked and all that. Lots of parents had put work into the event afterward so I felt obligated, although we did manage to get drunk between graduating and getting hauled off to the event.

So for $50? Hell yeah. For nothing? No way, it's a waste of an evening and they're all precious when you're leaving your friends behind soon.

Also we went all-in and bought an ounce for the next evening, got fucked up on the school's dime. So it wasn't that bad.

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EDIT with my actual take: all of the other answers in this thread amount to either a) do it for someone else, or b) do it because it's an important milestone. I reject both of those points of view as irrational. If your parents really care about you, they may want, say, a night out with you (fancy dinner, show, etc). They also presumably want what you want. And, this is only a milestone if you let it be. If you think that way, then by all means, walk. But since you clearly don't, ignore all the bad advice you're getting.