Being scared to come out

I’m so scared of coming out to my parents. More specifically my dad. If u don’t know me, I was born a woman but transitioned into a boy. I changed my name to Elliot. My friends and teachers call me Elliot. I told my mom but all she said was “oh I don’t think you’re trans! Your Brain doesn’t develop until you’re 23!”. That really ruined my confidence to come out to them. I cut my hair short and I try to make my voice sound more masculine but I hate having to hold back tears when my parents say my deadname. I hate how I feel more comfortable coming out to strangers more than I do my own parents. I’m actually tearing up while writing this!. It’s so hard for me. I know they’re very supportive of the community but what my mom said was very hurtful to my self esteem. She even bought me makeup and that made me very dysphoric. I just rlly needed to rant abt this