I am terrified of new people and making close friends what should i do?

For the past 4 years I have become more, and more terrified of new people and friends that I used to be very close with. I used to have very close friends only to find out most of them were talking about me behind my back or didn't even like me they were just using me. I would like to apply for a job but now as soon as I go inside to give in an application it feels like everyone is staring at me and judging me and I panic. It has gotten so bad that I rarely leave my house, what should I do?