<human>: My parents got divorced, I lived with my dad until I was 11 and my mom ever since.  I think we had a decent relationship, although I had some issues where I blamed her for leaving me with my dad, but I got over it for the most part.  My mom recently got remarried this year, her new husband is nice enough (although he's weird as all hell), and they recently moved to the same city my girlfriend and I live (we're finishing up school).  Her husband's got three kids from a previous marriage, two daughters and a son, and the younger daughter and the son still live with them.  Once again, they're all nice enough.

The problem I'm having is that when my mom moved here, she decided that she wants to "act like a family."  She's been wanting me to spend a lot of time with them, get to know them, all of that jazz.

It's not like I dislike them, but I don't really feel like involving myself in this "family" for a few reasons, mainly because of a few issues I'm currently having.  I'm just really busy and stressed out and don't feel like I have the energy to do so now.  It also doesn't help that my girlfriend's on an athletic scholarship and I want to make the most out of our downtime together.

Because I'm an asshole I've been doing asshole-ish things to try to get that point across, for example me and my girlfriend pretty much ducked out on Thanksgiving (we just popped in for a little while), I've been cancelling plans and not rescheduling, and plenty of other shit like that.  I feel bad about all of it.

Is there a way to tactfully tell her I don't really want to be a part of that "family unit" right now?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Mom wants me to be part of her new family.  I don't really feel like doing it right now.  Is there a polite way to tell her this instead of just doing asshole things like ignoring invites or cancelling plans?