I think it would be a good idea to apply for SSI. From what I have read, AvPD is classified as a ''severe'' form of ''social anxiety disorder'' and as such it should (imo) qualify for SSI. I suggest talking to a good psychiatrist as a starting point, if you haven't already done so. They could better advise you than I can. Thanks for posting! Maybe some other members will chime in with some thoughts.
You definitely deserve to get away from those toxic people and have a better life. Keep on with the drawing, I think it's great that you enjoy drawing