Welcome to the forum. It will take a lot of work on your part. This is a problem we all have since we left the cult and the reason is in the cult we was told everyone there was our friends. It took very little work on our part to make friends. In real life it take great effort to make good friends. I will stop here for there are better qualified ones on this site that can relate to you better and can give you good advice.
I am sure my wife will chime in on this subject. She is shy just like you. Good luck to you. So nice to have you on this board. Take care. Still Totally ADD