I too feel your pain. I find myself unable to do things because it makes me nervous or anxious or paranoid. Large crowds usually cause problems for me. In my work, I must go to people's homes and business whom I don't know. I usually have to push myself to get out the door. I think it may be that I am scared for failing at what I do. I usually don't fail however, so i am unsure of where it comes from. Most of the time I just have to force myself to do everything when I am depressive or anxious. Just do it. Sorry I don't have a good answer to your problem, just know youre not alone.