To put it bluntly, you are an idiot. Sadly, this doesn't subside in the least for at least a year and a half. It still hasn't subsided fully and probably won't ever, oh well. Part of me wants to tell you to run far and fast from the guy who's going to be your first boyfriend, but part of me knows that that may change how things wound up. And things wound up good. What I will suggest is not letting him influence you as much as he did. Listen to your mom. You don't want to admit it, but she is (almost) always right. Especially in regards to the two stupid boys you dated before J.
Speaking of J, you currently know of him, but would never in a million years guess what he'll become to you. He'll become your boyfriend, then your best friend. Your fiance, then your husband. And, finally, he'll become the father of your fabulous and adorable daughter. I know you think he's weird (he is, but it's okay) and wouldn't dream of dating him, but just wait until you see what he does to get your attention. Give him a chance and he won't take it for granted.
Please, oh please, appreciate the body you have. There's nothing you appreciate more post-baby than your pre-baby body. Although, it wouldn't hurt to start running or exercising because boy-oh-boy is your 22 year old self out of shape. Don't dye your hair red from a box with no previous experience and don't let your step-mom suggest a hair stylist to go to to strip the red out of it. They jack up your gorgeous spiral blonde curls and your hair will never be the same.
A couple more things you don't need to worry about: theatre and friends. Enjoy theatre for the fun it is. You don't always have to be the center of attention. You'll go to a great community college and have tons of fun in their theatre program. You'll also meet your best friend there, so don't worry about the friends you do or do not have in high school. There will be new friends, reconnections, and you'll grow closer to your mom and sisters. It will all be for the best, I promise.
I know everything seems tough, but in retrospect you'll realize it was so easy. Enjoy life and remember just how blessed you are.
-- Your 22 1/2 year old self
PS: You really should have realized how stupid those Myspace pictures looked.
PPS: DON'T FREAKING TOUCH YOUR EYEBROWS. GET THEM PROFESSIONALLY DONE.