I'm doing a dance for the university and we practice about 2 hours per week. There are 4 guys and 8 girls in the group, plus the male instructor who is also a student.

I've been excluded on several occasions as I've found out through my partners. The first was when the guys set up extra practice sessions and didn't bother to mention it to me; my partners agreed to let me know when. The other was when they decided to go shopping for the dance costumes, once again leaving me in the shadows.

I am being left out of the group, how can I confront the guys without seeming butthurt?