If you earn the money, then I would say it's time to claim your adult status and get your own bank account. But it sounds like they give you money, in which case they can decide to watch how you spend it.
N dealers aren't really a thing so you won't find one on the streets anyway.
All I can think of is to find a job and get some independence and autonomy. Otherwise you're still a kid, and your parents are still the parents of a kid. Doesn't sound like much fun for any of you, except for you in that they give you money when you're an adult. My parents didn't even do that when I was a kid, not even an allowance, so you're fortunate in that respect.
Since you're so closely watched, I'd advise that you need to think carefully about any attempt you make. If you fail, you'll end up in a psych ward, and when you get out, you'll be even more closely watched and life at home will be like a prison. If you think it already is one, you've haven't seen anything yet. So if there's any way that you can take the long view of things and start working on getting a job and moving out, that will give you something to occupy yourself with, will teach you skills you need for independence and responsibility, and at best you find you want to live and have the capability to manage life, at worst you still want to ctb but have the means to do it and don't need permission to do even the most basic things such as buying supplies.