I have to wait until I grow old enough to have more freedom to handle my time.
This is not a terrible thing?
I started making music in college. I spent a lot of my freetime doing it, and it was okay. But I have gotten far better after college, and additionally, I now have a better job and money to spend on things. Since graduating, I have gotten: a better computer (my old laptop would sometimes crash while exporting, would get underruns all the time), monitors (my old speakers were desktop speakers...), audio interface, etc.
There's no rule that says if you don't get a song signed before you're 21 that your career is over. Make do with what little time you have now, write down ideas, make notes of things you WANT to learn in the future, create patches in 30 minute blocks of time, I dunno. But don't worry; you have a lot of life ahead of you.