Your type 1 diabetes really throws a monkey wrench into what you want to do. You need your parent's health insurance in order to remain alive.
The best thing for you to do is to figure out something to do NOW and start earning money while you are still under the protection of your parents. This gives you experience and by saving the money you earn, it gives you something to start with if you really do want to move away and do something else.
Doing this without a plan is a lousy idea.
Escaping to Colorado sounds like more flaking out, By the summer in Colorade you might be living in your car or on the streets. Being more serious about your future and getting the essential schooling it takes these days to have a decent life makes more sense, there are 2 year technical degrees that pay pretty well, and have a minimal of useful education requirements.
You start with basic finance. You need to figure out how much money you can make by yourself. Then distribute that money into categories like first off paying rent. If you want to move out you need a place to stay. You need to figure out how much money you can afford to pay monthly towards rent.
As for all the stuff your parents pay tell them thanks for helping out but you will now pay for it yourself. Hand over your phone and anything else they pay for.
You are 19. You are free to walk out the door any time.
if you really wanted to support yourself, you would walk, but you don't, you are scared of being cut off.
get a job