::hugs::
As has been said, it may be that she's just worried about your welfare.. what other people think of you can very quickly turn into something important, when it comes to homophobes, intolerance, violence.. etc. It may be that it's not so much trying to get you to leave Lane, as just making sure you know what you're doing. Which, of course you do.. but mothers worry.
Just let her know that yes, you are aware, and no, you don't have a problem with it. Now.. if the issue is that SHE doesn't want to be seen as having a gay son.. that's a whole 'nother story. I'd be pissed off, as well.