Hi, I'm venting about something so I don't cut myself.(16 days clean)

I booked a day in the week with my Dad to have a conversation about my Transness and how I need therapy. I started talking to my Dad lightly about it tonight, so he wouldn't be stressed(as he gets stressed very easily). And I was calm about it and so was he(I just told him "I have some personal issues at the moment so I need to have a chat with you about it, it's not meaning to stress you out or anything but it's a needed conversation"), and my step-mom had started getting irritated as 'I was taking all his attention'(she doesn't say it, but she has tantrums about it).

My Dad was being very gentle with his wording not to upset me, he was being really sweet even tho he was anxious.

My step-mom(she had another argument with my Dad before dinner, but she kinda just moped in the kitchen, as I just ate dinner with my Dad, my brother and her) started to get involved, and starting going on how "i should have these conversation with (deadname)"(I didn't know my Dad told her about me being trans, but I'm not angry with my Dad for telling her, I'm upset that she started to tell me she knew) and I hold her no, as I didn't feel safe to talk about these issues with her(I don't normally get involved with hers and Dads arguments). And I tried to tell her it was not her business to say anything. I tried to explain to her "I feel like there's something wrong with me, I don't want everyone to know about this, this isn't a thing I want to tell everyone and put posters on the wall about it", she started going on "there's nothing wrong with you", and I kept telling her there was, because there was.

My Dad is a complete sweetheart most of the time, even if he drinks. But when anyone threatens his kids(me and my brother, even if my brother isn't related to him, as my brother is a half sibling on my moms side), he started to shout at her. As she kept egging him on, trying to make the room as uncomfortable as possible.

Then my Dad literally told her to get out his(he lives with my nan and grandad) house by this week.

So my Dad broke up with his girlfriend for me, I think? They have had lots of arguments(they've had 3 arguments this weekend) but my Dad has never told her to leave.

I hate my life, I don't know what to do