Do not build that time machine, seriously man, time travel is really confusing. Hell, if you read this message and listen to it this message probably won't even exist. Seriously, it's that confusing.

 Don't worry about it, everything will be okay in the end. And be yourself rather than trying to be what you think other people want you to be, you will be much happier. And finally, he isn't worth your time. Wait a little and you will find much better.

 Sex is not love. No matter how many times he kisses you and says how pretty you are, in the end, you'll just feel dirty.

 Don't friend zone him so hard. 5 years from now, you'll change your mind. Sadly, so will he.

 Tell him you love him. Never knowing how he feels hurts almost as much as seeing him with someone else.

 Don't make a decision based on what he wants, the emotional pain is going to out weigh the physical pain ten fold.

 Don't try to grow up so fast. It'll happen in due time.

 Thank you for not marrying the guy I met when I was 17. At that age you don't know what you want.