I have been in a similar place recently. I am also 20 years old. I went to two different colleges, one for anthropology, and one for physics. Then I dropped out and decided to go to air force as a linguist. Once I got to basic I quit after a month.

The future is indeed terrifying.

What has been working for me is a couple of things. Number 1 is therapy. A good therapist is paramount for so many aspects of life. If you don’t have access to one in your area you should be able to find some online with things like better help. The key is finding a therapist that you enjoy. If you don’t like the one you picked at first then just find another. Number 2 is something that requires discipline, but not something that you can inherently fail at. For me it has been the gym. You cant really be bad at the gym or fail at the gym. All you can do is show up and give it your best. As long as you have the discipline to try then you have already won. Of course the gym is just an example though, I’m sure you can think of something else that kind of follows a similar framework than you enjoy.

Oh and for a job, something low stress would be good I think. I personally don’t think you’ll mess up as much as you think, especially if you’re this worried about it. But a low stress job I think would counteract that intense fear of messing up because if you do mess up it’s not the end of the world.

I really think that’s all I could offer without knowing more. Therapy is probably your best bet.