(((d.o.a.)))
While I am very sad to read about your difficult childhood, with completely unaccepting {is that a word? I'm going with it!

} parents, it sounds like you have made some real healthy changes in your daily life. And that is very encouraging!

While the changes aren't comfortable for you to make, you are true to yourself & holding steady on what you believe. That is awesome!! woo-hoo
I *think* that your overthinking is a phase of emotional development. It really does sound as though you are on the right track, to me. While the process feels long and very frustrating, this phase will pass soon enough.
Very best wishes and gentle hugs to you!