Dear teenage me,
Lots of things to say here!
It's a stereotypical phrase now but "it will get better". You will find a friend that you will come out to in a short number of years! Also, your mom and dad will turn around in the future. The capability for them to understand is in them. Stand up for yourself, they can understand and we can make all of these years in between much better!
Also, um... Perhaps be careful with that friend that is the first you come out to. If it comes to a relationship, that's fine. But if it ends, then let it go. Treasure the friendship more, because the friendship is such a big deal. You will know that as I knew it at the time as well, but need to be even more careful than I was.
Take care of yourself. I know you hate everything right now. It's puberty doing this to you. When you experience any health issue, you must always face it. Everything will be okay, I promise. Getting scared and going into denial is a terrible thing, it will cost you a lot, perhaps even being with the one you love. Push forward, always. Oh, and in 2018 the problems in your feet are not plantar fasciitis, they are arthritis. Get tested. You will thank me.
Hard advice ahead: I am not very talented at music, there is a threshold that can never be crossed no matter how much you practice. This is the sad truth. It's important to understand this, because you might want to think of something else for college. This is not to say that continuing playing in ensembles is wrong, or that maybe majoring in Music History might work out. Either way, whatever is chosen, do it, get through it and get a career. I don't want to scare you, but there will come a day where the USA is taken over by a really, really bad man. Even worse than George W Bush. Far worse, in fact. He will have a lot of power, and he and his party will come after human rights hard. You need to get going forward with a well-paying career, because you will not be able to stay in Oklahoma. It will be on the wrong side and will take away these human rights. Build up your career, and move to New England! (maybe not New Hampshire, any of the other NE states are great). Actually, make sure you have the means to leave the country, as well, because in my time the nation is unstable.
Maybe don't move until after 2015 ends, though, because you're going to meet two amazing people around then.
Oh more generally: I know that puberty is driving your hormones crazy, but... Maybe try not to be so rotten to others, maybe stop with all of the drama. I know, drama is fun. But being rotten to people is not great. That includes band directors!
And um... be careful, be very careful around boys in your junior English class. Stay far away from them at all times. Never be alone around them. This is a topic that I don't want to go into detail about, but if anything inappropriate happens, report it!