I think I've had similar reactions to you, when i was at school ... i remember feeling really self-conscious and kind of hot and panicky when the subject came up.
Maybe it's a reaction because we're (sort of) hiding an important part of ourselves and when others bring it up and talk about it, it touches a raw nerve or something?
I don't totally know.
But i do know that it is entirely up to you when you decide to reveal this part of yourself, and there is no externally-set "right time". And however long that takes to feel ok, and SAFE for you, does not mean you are diminishing yourself .... it's a precious and personal journey ❤
It sucks that you felt your coming out to your Mum was forced and not ideal ...
I don't know if it would be helpful for you or not, but there's a support resource called QLife (qlife.org.au) ... you can webchat, call, etc, lots of different supports for people of all ages and identities ... check it out if you feel like it.
But i guess i just wanted to let you know you're ok ... you're not alone ...
I am listening and othere here are too, if you feel like talking more.
I hope you feel ok after your kinda stressful day, and i hope you've been able to do something nice to feel better tonight.