You will be addicted but you will get stop and it will hard as hell but worth it

 Don't change your future for one person, because you will meet more important people than them.

 don't waste your time hating on people. you won't get anything by hating people except,well, hatred (and a bunch of enemies). love them instead. it's much easier ;-)

 Don't be afraid to look foolish. Tell him you love him because he loves you too.

 Forget him and enjoy your summer. When you get back to school everything will be the same, but you'll never get those 2 lonely months back. Believe me.

 No one knows who they are as a teenager, so stop trying to be someone else.

 You are far more naive than you know. You know far less than you can imagine. Open your heart and your mind and forgive yourself your shortcomings. Find joy in each moment of each day. It will be worth it.

 see the blood that's slowly oozing out of your wrist? are you happy now to know that in any second now you're gonna open your eyes and see heaven (or hell)? well, it's not gonna happen. so you just better renew your mind and look on the bright side of things.