Go to the near college and they have specialist that will help you on that for free.
I'm not really anywhere near a college, and I figured I could save a little bit of time by asking here and from my friends/family instead of getting up off my lazy arse and biking over to the college

A work year is generally considered to be 2000 hours. I somewhat doubt that you can clock the 40000 hours that you are claiming. Even if you spent 12 hours a day playing your musical instruments, it would still take you a little over nine years to clock 40000 hours.
You're claiming 12 hours a day every day 365 days a year since you were about 6 years old.
If I were you, I'd pay a little closer attention in math class.
As a 15 year old, claiming 20 years of experience is simply going to get people to laugh at you and not take you seriously.
I've had 10 years of instruction on the violin, 4 on the viola, 3 each on trombone, tuba, bagpipes, and 1 each on trumpet and guitar
10+4+3+3+3+1+1=25.
25years of experience altogether. I didn't say I had actually PLAYED them, I just had the experience. Much like saying "I've got 20 years of experience playing football" and "I've spent 20 years playing football"
I should probably have made myself more clear though, sorry.