Don't resist going on antidepressants for so long. Just go on them. They help, I promise.

 Fall in love, but be happy about the end result

 Stop wasting so much time wrapped up in teenage emotional angst bullshit. Life isn't as bad you think it is, believe me. You're gonna waste some prime years in your room crying for silly reasons. Enjoy the ride Younger Me, it ends one day.

 Love will hit you like a ton of bricks. Let it :)

 Don't give up, you'll make it through without her. She doesn't matter. It'll hurt though and for that I'm so sorry.

 grow a fucking pair, take whats yours and accept nothing less than greatness

 You get better looking and more confident. You fall in love, it's not conventional and it hurts, but it teaches you things you really needed to learn. You have the greatest friends you'll ever need and you laugh more than you thought you would.

 You were right, she's the one