Am i allowed to say i'm trans?

i have an un-supportive family and they think they're basically saints for accepting lgbt+ people. but dont believe in the t, of which i am.

i have dysphoria, i scratch and cut at my female body because i hate it. But i can't do shit about it until im out of this house, so can i say to people that im trans? can i make up the excuse of saying im genderfluid if it means my family won't mentally scar me?

overall, i want to know, am i allowed to say im trans? yes, i am bunny and i am back with suicidal thoughts.