There are some things you need to know as you grow up.
First of all, never eat avocados. If you heed this warning it will save you from a night of sickness and sleeplessness. They make you sick, don't do it! (At least, I think they make you sick and I wouldn't take the chance of eating them again, it's not worth it, and you don't really love them anyway.)
Secondly, avoid tackling in soccer with the outside of your foot. You will sprain your ankle and it will swell up to the size of a softball. If at all possible, avoid the sprained ankles, they really hurt! You will enjoy your sports experience much more if you follow my advice.
Wear sunscreen, getting sunburned isn't worth it.
Don't just buy stuff at the store because you want it. Think it over, if you can't see yourself using/wearing that item in at least 1 year, don't waste your money.
Take a photography class in high school.
Try not to procrastinate so much, it really will make school easier and you'll be more rested.
Look out for that young man in gym class (and every other class), he is cute and seems overconfident, but that's because he likes you. It's okay to like him back. (Josiah wanted me to add this one)
Cows are not that scary. They might be big, but they are gentle, curious, lovable creatures. And yes, they do smell, but you'll get over that.
And most importantly, don't be afraid of being who God created you to be. In order to learn this, don't look around at what other people are doing, don't compare yourself. That is a game you cannot win.
You were made in the image of God. You are smart, beautiful, and creative, because He is. Get to know Him and you will know who He created you to be. Never stop pursuing, knowing, and being known by God. Hunger after it above all other things. He knows your heart.
He has given you dreams. He has plans for you. He wants to use you. He wants to fill you with joy. He wants to free you! Don't be afraid of what He may ask you to do. He will give you what you need when you need it.
Don't be afraid of other people. God has given you the words to say, if not in person, then in an email or letter. We're all human and all walking around with scars and hurt, so be sensitive but strong. Speak the truth in love (Ephesians 4: 15).
Please, don't lose hope. Pray more for that one impossible thing, you'll know what I'm talking about when you're older. Don't give up hope, I haven't given up hope for that one yet, even though it does seem impossible.
Read/devour the Bible. You'll need those words of truth. Pray. A lot. It really makes a difference.
One last thing. Your life won't turn out how you expected/dreamed it would, but it will be okay. It's called growing character, and although painful, it is worth it. You'll make it, I promise. God is still faithful.