You made all the right decisions. You're heart gets broken over and over but its all so you end up here. Make all your mistakes because they make you better.

 Stop being so uptight! Life is fun, enjoy it.

 just tell him you love him. don't wait until you're married to someone else to admitt it

 Do NOT pick up the book that cute guy with the smile dropped on the train. Step over it and step away.

 Hurting yourself isn't going to help. It may seem the best way to go, but really. You're just keeping yourself in a dark place. Give yourself a break. People love you. Just wait. You'll see how wonderful the world can be.

 Instead of that kiss goodbye, slap him. He has a girlfriend.

 You should have kept your mouth shut. You shouldn't have started smoking (esp. not that young). You should have drunk less and spent more time at the gym. You should have pushed and worked harder to go abroad. You should've been more careful. God only knows what you should have done about her or him

 Everyone makes mistakes. Forgive yourself and others will too.