Career for someone who's extremely worried and paranoid?

I've found paranoia can be useful for research/investigation type things. You get to review all evidence and look at details from every angle before coming to a conclusion. Also it's good being able to work alone.

im the same way and my goal is pretty much to live in a bike camper and sell paintings

I don't think this should guide you in a career. This sounds like a flaw, not a quality an employer looks for. Instead, I suggest looking for something that fits your qualities and somehow takes care of this flaw, like something very safe (working in an office or remotely) with little risks.

Detective

Be an Actuary.

Late night radio personality.

police

Watch a movie called Along Came Polly.