So, a kind of follow-up.

[Pink Freudian]

I'm still scared my mom would be really mad and quite possibly do something really drastic if I told her my orientation...
On the other hand, I thought she would be mad that I was a masochist/into BDSM. Something happened... She found out. She doesn't threaten to hit me/spank me any more. Just grounds me now. But I mean, she didn't really make a big deal about it. So I've been honestly thinking about telling her, even though I really don't want anything to do with her.... I'm just really unsure. ._. Any advice? sweatdrop  

[Gordums]

Telling your mother about your sexual orientation isn't required, especially if you feel that it will negatively impact your living situation or cause you harm. However, we don't really know your mother so the choice is ultimately upto you