How I can be better in life?

Hi, how i write in a title of post - I just staying in one place in my life from a long time. The worst thing in it is that i really dunno what I can do exacly. But from the start. I have a social anxiety and cannot live properly in society. I mean I really want to make social contacts etc but I have an issue with it. In everyday life I have fed up with social contacts because people think that I am some sort of freak (I dont talk much and dont spend some time with people) and with time they laugh from me which is very uncomfortable to me. Because of that I after classes at university and work I dont have the will to self improvement myself or do something creative or simply doing something. I just vegetating my life right now and worring about next days - how I can withstand bad thoughts etc. Literally my life right now is a bunch of bad thoughts and grieving sometime. Really, what can i do? I quitted gym 3 months ago and feel even worse after that.