Definitely not your fault in any way shape or form that you were raised surrounded by azzholes.
Don't place the blame on your shoulders, none of it, because it simply does NOT belong there. Never did.
It's good that you're aware of how your childhood may be impacting your life, and with tiny little cub steps at a time, you can try to change what you think needs some tweaking.
PS. You're a sweetheart my dear friend. Anyone who found ANY reason whatsoever to dislike you were delusional or stupid, or both!!!
PPs, very proud of you for using your voice, you've become so brave!
You're proving that change is possible for you...