Hey there,
I just wanted to reply to this since i've been reading a lot and have seen you help a lot of people and let you know that you're not alone with your childhood/early years. It seems like we were, and in my case still am, quite outcast from any group since we don't mentally fit in with males and don't physically fit in with females, so it creates a terribly lonely middle that leaves you in a state of confusion for a long time so it's really no wonder why things like social anxiety start to come into play - even if we had something in common with someone it's not the type of thing you jump up and shout "me too!" about. And becoming an adult doesn't automatically make this past go away, despite what people might think.
As for parents, it's hard to discern what they really believe. Older generations never seemed to really deal with any of these issues even though many probably went or are going through it, so perhaps it's more of a fear thing on their part rather than hate driven. You say you haven't had the nerves to do anything about it but if it makes you feel any better you've done a lot more than I have to try and determine where you want to be. Did the reaction from your mother when you came out as trans make you apprehensive about mentioning it or confronting it again? It likely would with me, but I'm thinking that would only compound trans feelings, the man up approach isn't doing s%%t for me not matter how much I try and it gets harder and harder to live as a male with this on my mind. Perhaps with some time and explanation your mother might be more understanding, but after all the s%%t you've dealt with you have to come first this once at least.
Sorry, I wish I could provide some actual answer about what to do but it's really awkward when the only power you have is to relate to something. I hope you find happiness