I understand u, u feel left alone and having to take care of everything...
Its gonna be ok bae, 1 thing that is sure is that i'll never leave u no matter what u do ^^
For ur friends, try sneakily asking about gay people, for ur mom just give up on that old crazy bitch and for the group just say that no matter what they think of u after, u feel more and more incomfortable with their acts... ik it might sound scary babe but i'll always be there for u in the mean time...
If u ever need comfort i'll be there, i can risk to lose everything for u and no matter if u hurt urself or others leaving u is a crime to me (and yk well i cry when i do something minimum bad so imagine doing a crime ;-;)
Ur not mentally ill, ur just different, and ily deeply for that