I feel that way a lot too. I'm not sure how much you shared but do you think that maybe your perception of over sharing might be different from others? I have a social anxiety as well and every time I talk about something personal to someone I feel like I said too much and nobody is interested and it bothers me for a while but then people tell me a lot that they don't know much about me so maybe it just feels that way for me. Just a thought, your case might be different