I may be trans and I am so fucking scared

I dont know what to do. I wish I were a boy, I hate being born in a female body, I want to be perceived as a boy so badly. What should I do? My parents would never support me, my friend would laugh at my face and would be bullied? Should I tell this to anyone? I have a therapist, but she does not understand much about trans people, so if I tell her that, she would transfer me to another therapist. I got a haircut recently , wich makes me look more masculine and my life has been a hell since then because my sister can’t stop make mean comments about how ugly she thinks it is. I bought a binder online, my parents still dont know, but they would be really mas if they find out. Wearing masculine clothes makes me feel very confortable, but I am not allowed to do so. I just wish I were born a cis guy, I dont want tk be transgender.