I can relate!
I am 13 and a rec gymnast around your level. I started gymnastics when I was three, but the thing is, that when you are a regular rec gymnast and your parents aren't considering putting you on a team, it's really hard to get there on your own. I understand. I didn't think about competing until around 5th grade, and even then, I felt like I was too old. I stayed in my rec class until at the beginning of 6th grade, I moved into a higher level class with older kids, and began to realize this year (7th grade) that the reason I wanted to compete so badly was because I wanted to be with older kids and felt like I wasn't improving because I was only coming to the gym 2 times a week and wanted to be there more so that I could improve more and get onto a higher level team quicker to be with people my age. But now there are people my age in my class and I am having a lot more fun, even though I wish I could be at the gym more, and still would like to compete, though not as badly.
I never thought that in order to make the team you had to have the skills. I always thought of it that you had to prove to the coaches, with your personality and work, that you would be fun and worth their time. That's why, while reading your posts, I'm thinking that if you made the coaches want to coach you because you trust their advice and trust that they will spot you--which they will (if they like you
) because they would not want you to kill yourself in their hands. I don't mean to be a teachers pet or anything, but I think that coaches would give you more respect if you showed them that you deserve it. It would still be useful to get your back handspring meanwhile, but if they see that you would be a good member of your team, they will push you to get it, and you won't have to stress yourself out by pushing yourself.
Does your high school have a team? Mine does not. But if it does, it sounds like you would be the perfect fit for high school gymnastics.
Good luck!