Ok please adults answer if i do something bad my step dad hits me on my privates and it hurtz but i told my?

best friend travis and he said no it shouldnt hurt because ur a girl and u dont have and thats why it hurts boys. but i dont know why it hurts me to. my mom works in the after noon so i spend a lotta time with him a lone and when i do bad stuff or even if i didnt he hits me there and i just go stay in my room to avoid him but some times he comes inside to if hes angry. please dont tell me why are u doing bad stuff be cause i dont do them on purpose but he still gets mad. my big brother his names andrew hes 22 and he lives alone so some times i go stay in his house but my mom doesnt let me stay a lot because his friends and stuff come over and i annoy them so i have to go home and my stepdad said he can do whatever he wnats coz hes not american hes lebanese and its legal there and i dowana tell my mom coz she already has a lotta problems coz of me. should i tell andrew? but andrew already doesnt like my stepdad so i dontwana make him hate him more. can adults please tell me what to do and if it hurts even if im a girl does that mean theres something rong with me?