I know what you're thinking. (or not thinking) "Omg DeepCircle hasn't been on in months!" Yes. I know. I came here specifically because I came across a personal issue that has really been affecting me. Let me start off by saying that I'm not trying to brag about my accomplishments. I don't believe in that crap, okay? Let me start off by saying that I am 13 years old. I am being enrolled in University 3 years earlier than what my mom promise, which was going to be 16. Well we are already trying now. I have skipped several grades and I've been told that I am a prodigy student. I play piano, I paint and I'm a performing artist. Now here's the issue. I HATE being a prodigy student. Wanna know why? Cause I've set my expectation bar sooo high over the years. I want to quit school, I want to go off and make a living out of the things I'm passionate about, and I'm not passionate about the cellular structure of a nematode. My parents refuse to let me drop out although I'm sure I've absorbed all I really NEED to know. I'm simply being taught nonsense at this point. Don't get me wrong, I'm a total Sheldon Cooper, likes to think I'm smarter than everyone else. But I still want to have a dream life. I'm super impatient and that doesn't help myself at all. Does anyone have advice? I want to be promoted to un-schooling but my mother refuses. Am I wrong about this? Can someone give me some advice? It's really killing me.

I feel you. I wouldve skipped a few years too, but my father didnt allow it and I didnt know better at the time.
I dont think you understand the point of schools. You dont go there to get knowledge. You go there to get a paper that allows you not to work at McDonald's. There are people who manage to drop out of school and do something they want immediately, but that's rare and being smart isnt nearly enough for it to work. You also need some luck and a way to actually get money. You dont seem to realize how long you will probably live. Its not like you cant follow your dreams after finishing college, is it? You might waste a few years of your life doing fuck all because of that, but it dramatically increases your chances of getting a decent work. It would help to know what you actually want to do, but you can do most (at least kinda do) even in college, especially since you dont really seem to have that much trouble getting through schools. With most things you also cant just immediately get enough money to live off it.
Another thing is that your opportunities to get money are severely reduced by being young. Idk the exact age because idk where you live. The society we live in simply relies on people going to school.
Also, you are a teenager. I cant really say much because i am one too, but you should know yourself how quickly your opinions can change if you look back at what youve done and thought in the past few months on years. I think it is a better idea not to do anything harsh...
However, if you have a plan and you are 100% sure it will work, (as in you cant find any reason why it shouldnt work over a longer period of time, like a few months. And even then you should probably consult someone older who already tried doing something similar to you. There will probably be unexpected complications no matter how much you prepare. Too bad school doesnt actually prepare people for life...) go for it, why not after all. If you figure out how to make money by doing what you want, you dont really need your parents approval in the first place.

One thing you might find interesting to do is to try and develop/figure out your perception of the world and how it works, as well as what your purpose and meaning in life you want to have. You may be smarter than most people but that's only in one aspect of things. Being able to solve complex maths equations or play elaborate songs on piano is good and all, but it doesn't help you with other kinds of factors in this world like human relationships or having a purpose/meaning in life. All we do is copy the same mistakes and perceptions as the generations before us, so maybe you should put a lot of thought into things on your own, and decide how significant each factor truly is.
Sheldon is smart but you could also say that he's really dumb, or only smart in one way. Since you're young I recommend putting a lot of thought into things, and deciding for yourself how this truly works.

Well, I had my rant. Goodbye and good luck.