So, this has been on my mind a lot lately, so I need to get it out somewhere. (me and my gf have been together for almost 3 years now for context)

For context: I like techno and house music, my girlfriend doesn't.

Incident 1: Last summer, one of my favorite, if not my favorite, DJs ever was touring to my city. My girlfriend suggested she'd go with my because on that date I had no one else willing to go with me. I was ecstatic and booked the tickets straight away months in advance. Now the things is, the DJ was playing in a club, and usually the main act there starts around midnight or 1am.

So, come the day, I'm more than ready to go, but as we're heading to the club my gf already starts complaining "I'm tired, is it okay if we leave a bit earlier?". And I respond that I want to see this DJ playing though. She doubles down "omg I don't want to stay that late, please let's leave a bit earlier". I replied that she was the one that INSISTED she go with me and that she please let me see the concert I bought the tickets for. We ended up arguing all the way until we arrived at the club. Eventually I did get my way and got to see my DJ, but all the while she was standing near the wall and just sulking.

Incident 2: A couple weeks ago, another one of my all-time favorite artists was touring to my city. Again, I had no one to go with, and my girlfriend again suggested she go with me, so I booked our tickets in advance.

The day comes (and again the DJ will be playing in a club) and my girlfriend starts complaining again. As we were getting she said "yeah but sorry, Techno sucks, I think it's shit. Robert (mutual friend of ours) also says he doesn't like it." (even though this DJ doesn't even make techno, entirely different genre) and then she again complained about being tired and said "You are not 20 anymore, ok?"

That just really hurt and I started crying and said I didn't want to go like this. Eventually she apologized and told me "Please, I don't want to see you disappointed. Come on, let's go". But the mood was ruined for me. I don't want to go out while all I can think about is how much my girlfriend is hating it. I just didn't want to go anymore and so we ended up staying home that night.

Incident 3: This weekend, a couple of friends and I went out — it was the first time I’d done that (going out with just my friend group) in probably two years. My girlfriend wasn’t there that night. And I had an absolute blast, and that’s honestly an understatement! It was the most fun I’ve had in a long long time.

No complaining about being tired. No complaining about my dancing "can you not dance like this, it's cringe". No complaining about the music.

The difference was night and day. Now I'm really starting to think that my girlfriend is a killjoy.

Or maybe I'm just a selfish asshole and I'm just overreacting? Or is this a legitimate concern?