RainyEngland your post could have been mine .
I am OK in certain settings but when out of my comfort zone I feel terrible .
It's strange though as I could talk to a complete stranger in the street no bother but it was the work place I struggled most . I got it into my head no one liked me and I reacted accordingly taking harmless comments personally , worrying what i'd done wrong ,stewing over trivial things .
All of it was my thinking wrong and as Kenton says CBT is an excellent therapy that teaches how to change this wrong thinking .
I think with me I carried a lot of guilt about past events and projected this outwardly if that makes sense . Put another way I hated myself so found it hard to mix properly .
I know in UK the mental health system has long waiting lists for CBT but you should ask your doctor to refer you anyway and ask about an online CBT course called beating the blues link
Practitioners - Beating the Blues®
Good luck