I'm not sure what to do

so i am demisexual and if i had to date anyone it would be either gender (i'm complicated) and even though my parents say that i can be whatever sexuality i want to be whichis good💕. But i have tried to tell my parents (well mum at least) that i am demibisexual and she doesn'r like it and denies it and i wouldn't tell my dad because i am scarer of what would happen and i won't. So what i need is some help in needing to know how to stay positive and i need ways to ignore my parents thoughts. So any thoughts please....