Wow! That’s tough. There have been so many couples who let love keep them together despite their family’s opposition, Now you have a girlfriend who won’t be with you because your family doesn’t support you?
It sounds like a couple of things are happening, I think she is upset that you have not come out to your parents. I suppose she could worry that you are not serious about being a lesbian, but that’s kind of silly. Perhaps her greater fear is that you may leave her because of your unwillingness to stand up to your family.
The other thing I’m detecting here is that she has pretty much left you. If she says not to wait, that’s a supposedly gentle way of saying, “no way I’m coming back.” She is pretty damn sure she doesn’t want you any more. Which makes me question how much she loved you in the first place.
I suspect you’ve been trying to protect yourself from the pain. You don’t want it to be over because that would mean you have to face the pain of rejection and loneliness. Worse, you have face this pain with no one around who understands… and really cares. Unless you have some friends who might get it. So you cling to that little hope that she might come back. It gives you an excuse to put your life on hold,
I think it is time to face the music. I don’t think you would have asked this question, otherwise. What you feared most has happened, and you are alone and you are in that unbearable pain that still must be borne, All I can say is that you should find friends wherever you can—preferably in real life, but if not, then here. You’ll need a lot of support and you’ll be doing a lot of crying and feeling so very alone. It’s hell. But I’m afraid I don’t think you can hold it off any longer.
[I hope I’m not being too dramatic, and I really hope it isn’t as bad as I’m thinking. Best of luck to you.]