if you could write a letter and send it back in time?

So..I was listening to this song..and it was about a guy sending himself a letter back in time to himself at 17. He talks about what he would say to himself, and also gives himself advice. So it got me thinking, if you could do this, and write to yourself about what you know now, what would it say? 
I will start.. I would tell myself to not be in such a hurry to grow up! I would tell myself to wait just a couple of months longer to have sex, because my first time was with someone who didn't matter, and my second was with someone who was my first real relationship. Also, to not be so serious, it's okay to be silly. 
I would also tell myself, it may not work out with those other guys, but the pain won't last, you will meet a wonderful man and marry him. 
I probably could tell myself a lot more, but this is enough..what about all of you?

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