I just want some honest opinions

My bf of almost 2 years is really into heavy metal. I'm not like a "metal head" but I like listening to it sometimes, I listen to different music depending on my mood. He is always going to concerts but I'm usually not invited. There was a couple of times I asked if I could go, and he said that he was just going with the guys & they will be in the mosh pit all night & I might get hurt, plus he doesn't want me to feel ignored while hes in the mosh pit. He said if there were other girls in the group itd be different. I told him I really dont mind being the only girl, and I'd like to come to a concert with him sometime. He is going to a couple of shows coming up in the next couple months, & said to me "would you want to come to a show with us? Even though you probably won't have a good time?" I laughed and said "is that a real invite or a half-ass invite? 😂" and then we never really talked about it again. Its not like I'm SUPER butthurt but sometimes I feel a little left out lol. Opinions? Am I being too sensitive, should I just let it be a guys night thing? He really doesn't go out with his friends unless hes doing this, and it's only once every other month or so