To my past self,
Life is a hard thing to go through. I can honestly say that I don't remember a time when it was easy. Things such as self-doubt, self-confidence, and outside pressure are going to develop more and more as time goes on. On occasion, you're going to give into those outside pressures. You're going to hang out late with friends doing absolutely nothing. You're going to stay up late talking with one and helping another.
There will be tears. You will laugh so hard that you cry, you're going to cry so hard you laugh and everything else in between on the spectrum. Your heart is going to get broken and you're going to break a few hearts. It'll get better. Time heals all wounds. Remember these words because they will come into play: "In time you will be fine."
Family will always be there for you. Parents will fight and yell but they will always have your back. Your brother is your best friend, stop trying to fight with him. I wish I knew this sooner. Grandparents might be difficult to deal with but there will come a time where they are too far away to see on the weekends, let them be concerned.
Stick with Tae Kwon Do. Never give up. It's the only thing that will stay the same no matter what. It's what keeps you active and level headed. It may also come in handy one day although so far, no one has tried to attack you.
No, you're not going to marry him. At such a young age? Nothing is written in stone. Nothing is forever. I'm sorry that it hurts. I'm sorry that I can't tell you it gets easier. Be prepared to have random things bring you to tears. Time heals all wounds. In time you'll be fine.
Don't be afraid to accomplish your goals. You can be a veterinarian if you put your mind to it. Don't let anyone change you. Don't change for anyone. Be the best you that you can be.
Pay attention to everyone and everything around you. There are amazing adventures literally just around some corners. Just take two steps back and look at everything. There's bound to be someone trying to make friends or an amazing opportunity there somewhere.
Lastly, laugh. It sounds weird but there is going to be points in time where all you can do is cry and feel hopeless but you have to keep going. The point of life is to overcome your struggles and not let them defeat you. You're stronger than you look. Don't let anyone take away that sparkle of yours.
Sincerely,
Your future self