I'm too scared to have a job

I'm a stay at home mom. Have been for the 2 years. I'm only 19. I want to do a lot of things with my life. But I'm so awkward that I can't stand being around people. I don't have any friends. I'm just not comfortable around people. I had one job, 3 years ago. I only had it for a few months. I never spoke to anyone except my boss. The only reason I got the job was because my mom worked there. I felt so terrified the entire time at work. I ended up quitting. I'm so scared of messing up, not being good at it. Hell I can't even be a cashier because what if I can't count the money, what if it takes me too long, what if, what if, what if. I've tried anxiety medication, didn't change it. I have even tried therapy. I don't even leave my house unless I have too. I'm scared to do laundry in case one of the neighbors come out. I don't know what to do.