what do you do when your own mother tells you to give up? when she tells you that she has no faith in you? do i completely shutdown? cause that is all i can do right now.

i might be leaving for a while. goodbye

So, a couple years ago i came out to my parents and told them i was bisexual. and they chewed me out cause "it doesn't exist" they are all for gay rights and such but not bisexual. And to avoid any further problems with them i act straight. but they think im sexually confused. Its getting harder to pretend im not bi. Is there anyone out there that could give me just a little advice? if so, please, please help me!