
if it is not safe to come out, you should not come out. if you do not have somewhere else to go or are dependent on her in any major capacity, then it is a very risky move to come out. yes, eventually you may have to. but wait until you are SAFE and can be sure your life will not be ruined if she kicks you out or cuts you off (if there is a genuine risk of that happening)
okay i totally get her point cause it sucks to sneak around and to keep all that a secret but still it's your life and you have to do it at your own pace and if you don't feel comfortable coming out to your parents/ mom you should talk to her about it and you should find some kind of compromise, or maybe it's just not the right time...
but also your mom shouldn't keep you from living your life and she shouldn't decide who you want to be with. in the future you will have to talk about it with your parents and like i said you have to do it at your own pace but also, you can't pretend forever and doesn't matter the outcome of the conversation you shouldn't make yourself small for them...