<human>: Condense the text into a few key points

Me (21m) just got a little more serious with a woman (20f). We've been seeing each other for a few months, but only recently actually started being exclusive and using the labels. So, it seemed a little sudden, I suppose, but My girlfriend did the whole Facebook thing. Not a big deal to me, but it made her happy so I went along. 

The thing is, I haven't really mentioned her to my family. My aunt and dad kind of know, because I got tipsy at Easter and chatted about it. My mom though always gets super weird when I try to bring up my relationships. She puts on this façade, like she's trying to be normal but I can tell it bothers her, so I just kinda stopped talking about them to her. I know, maybe not the best course of action. 

Anyway, I guess what I'm asking is for tips or advice on how to approach the topic with her, and get her to realize that I'm a grown ass man who is going to have relationships, and she needs to stop being weird about them. It's really hard for me, because we've always had a really close relationship in pretty much every other aspect.
<bot>: Mom gets super touchy and weird when I bring up my relationships, need to figure out a way to make that stop.