I have anxiety so bad that all I want to do is sit in my bedroom?

25, single, live with my parents, unemployed. It's not that I don't want to lead a meaningful and productive life, but I have anxiety so bad that I am unable to perform day to day tasks. I have a very keen intellect and have been told I am good looking. But whenever I go to school (I have twice) or find a job, I am unable to perform competently and it doesn't make any sense to me because I very well know that I am able. How do I identify the reason(s) for this lack of motivation?