Asking for help w/coming out

Okay. So recently I have discovered that my stepmom is unsupportive of me being LGBTQ+ (FtM trans and bisexual). I wanted to come out to her but now I'm not sure. I still do, but I also dont at the same time, and the stress from it is causing me to be in a really conflicted mood most of the time, so I want to get it over with and just come out. But I'm not sure when or how I should do it, and trust me, given that I'm trans, bisexual AND 13 yrs old, it's really hard. I cry about it a lot and it scares me bc idk what will happen when I come out to someone.

Please help me. Tell me what I should do. I am so close to being able to do this, but I need help the rest of the way through. Also if you're curious, I am out to my close friends, a few teachers that I trust, my mom, my stepdad, and my brothers.

Thanks😀