AITAH for not telling my mom abt my stepdad?

AITAH for not telling my mom abt my stepdad?

for context im a minor and my stepdad started touching me i ask for a hug and he starts trying to touch me and i keep telling him to stop and my grandmother has cancer so my mom left for 1 month and he started getting on top of me pinned me and did things i won't put details to and i finally told my bff not my mom bc she scares me she drinks and is an alcoholic and my bio dad i have blocked and i just told my mom and she is trying to blame it onto me and i feel like im imagining things and somehow it's my fault she is very mad at me for it but imI'scared to tell her anything....

i just wanted a hug from my dad.....

AITAH?