If it helps though I am not qualified to diagnose you but in my opinion you are suffering from social anxiety and maybe depression.Back in my day they called this social phobia which is a term that reflects how intense the fear of strangers and socialising is.I had it and still have to some extent and I have a history of being bullied and abused,I know people have emotionally wounded me a lot in the past to the point that I was scared of any contact with people I didn't know,and still to this day I am reluctant to meet with new people or socialise.It was at it's worst age from 18 to 24-28.

It does help to know how to get well if you know what your diagnosis is.You could approach your GP saying you think you have social anxiety and see if they can do a diagnostic test and offer CBT specialised to this condition,cos I think that is the treatment for it.

I hope you get the answers to your questions and wish you well overcoming this condition.