<human>: So, as the title says, I'm 33, and I don't have much in the way of a social life, and I'm either fine with that, or convinced myself I'm fine with it.  

I had several girlfriends through my late teens and early/mid twenties, and was even engaged at one point, but my last "real" romantic relationship ended over eight years ago.  Since then, I've stuck to casual sexual relationships with women that I make sure are unavailable long-term, and honestly have little interaction with them aside from the sex.      

Outside of purely romantic stuff, I tend to accept the frequent invitations to do stuff that I get from friends rarely.  I'll attend work functions and the like to not appear rude, especially when they're specifically scheduled around my availability by coworkers who really appear to like me quite a bit, and I'll do the same with the other groups I'm involved with (I teach sailing during the summer and play beer league hockey), but if I had my druthers, I'd probably never do any of the extracurricular bonding stuff.  I'm not entirely sure why I'm like this, to be honest, and I wouldn't even have started questioning it if social pressure to be different hadn't started to steadily mount.

My family's the biggest driver.  My mom's taking the approach of talking about how when she retires, she's planning on volunteering in a maternity ward as a baby cuddler or something.  I'm getting the not-so-subtle message that she wants grandkid babies to adore.  Long-term friends that I've started to pull away from over the past several years have straight out asked me what's up, and I don't have a real answer.

I don't feel as though I'm depressed or sociopathic or anything like that.  I'm not pining away for a steady girlfriend.  But others' discomfort with my comfort at the way I'm living my life has started to make me wonder if there's something abnormal about me.  What's reddit think?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Keeping sexual relationships purely sexual, not wanting a girlfriend, not wanting friendships, wondering if that means I'm headed for the nuthatch.