Should I go to this Mother's day event? (Please read)?

I'm an adult (upper 20's) and I identify with my father. My mother seems to take every chance she gets to invite her whole family (my grandparents and uncles) to every family function. My mother has never entertained anyone, so it's at my brother's place, (who, recently, I'm fed up with.) My grandparents have criticized me all my life......called me fat etc, when really I'm not that fat nor ever was. I know my cousins dislike me, and I couldn't care less. They love my brother. The whole family is self-obsessed and I can't deal with them. I usually retreat to a corner. My mother never talks to me. She will talk to me, but when I attempt to talk to her it just doesn't work. Today I sat for 15 minutes with her and my niece and she only talked to my niece. I rarely see my father, so he'll be there, but I know he's going to hate it. The last few family gatherings I've been to I've vomitted afterwards because of anxiety. My mother tries to push these things on me, but when I get there she has no interest in talking to me. It seems like everyone just goes through formalities, I put up with a few fat jokes (I'm not even really fat.....chubby and muscular) and then I don't even relate or even really talk to anyone. I'm kind of venting here, but my question is, should I just suck it up and go deal with it, or would it be ok to just skip it? It's not like my mother will even talk to me. Everyone will ask where I am, but no one will really care. I'm wavering about this, so questioning what you think.