What Causes Self Isolating Behavior?

Hi. I am at a place in my life where I just cant move forward. I dont like to go anywhere or call anyone anymore. Don t try to do anything for my self, for instance, Get a job, Go out with friends, Call and speak with family... It just seemed so nerve wrecking to interact with others. Its not like I dont know that im isolating myself, cuz I do. its just get so worked up about going in public and having any interaction with anyone , anytime. That I know Cant be normal. I cant myself worrying about thing that nobody else thinks twice about. When I do go places, Its never alone, but when it is, I am pretty much in a rush it feels like. I dont remember the last time I just took a walk through walmart without worrying about what someone else thinks about me, or if Ill get everything I inteneded on getting, so i dont have to come back and put myself through the judgement ... Does things make sense doc?