Extreme fear of talking about myself - need help

I am male in my late 20s. I am always so regretfful of the past and i am also thinking of things that i should have done or said....

I feel guilty for lying about myself to people or not telling them things about me

The thing is i have such high social anxiety that i am scared of talking about personal things as there is a potential for people to judge me....i always downplay things

For example there are people i have known for years that dont know how many siblings i have or that two of them live in the states..or that i used to play tennis tournaments or that i was in a fraternity or that i was a camp counselor

I am scared to death that if i tell people i have known for a long time about this they might get pissed at me for not telling them before about this

I also lied about the school i went sometimes (i went to a private school so i didnt want people to judge me and say " you are rich")

Please tell me what i should do!! I am extremely terrified ppl will be upset at me I never lied out of being evil, it was always because of extreme social anxiety

Plese help me