DO NOT LIE! it will come back to haunt you and she will find out even though the truth hurts its the best option...

 Being a kid really doesn't last forever. Remember that. I know you're young but try and concentrate on today not tomorrow. When you're my age I'll do enough worrying about tomorrow for the both of us.

 Write more stuff down, I'm having trouble remembering you right now.

 The boy who first appears in your diary as 'some other guy I don't know the name of' will turn into the man you're about to marry seven and a half years later.

 The bad boy will never be worth it. He WILL hurt you & you WILL spend your entire life worrying about him...even when you're broken up.

 When she asks what you're thinking, tell her. It wont scare her off because you were right, she's not going to call you on Thursday anyway. You'll never speak to her again. Unfortunately, you'll still be in love with her seven years later. Sorry.

 He'll still love you if you tell him to stop.

 Do everything you did. Even the mistakes were perfect.