Ranting about school life

Sometimes I feel like most of my classmates don't really like me that much, true I don't really get along with them and I don't really make an effort to go to attend classes that much but oh well..

 There is this girl in my class, she's my seatmate, that's really trying to make me hear her nonsense comments though, like fr it's getting really annoying. She'd say comments like "if a certain person doesn't want to join a group, but the group is already fine without her, what will be the negative effect of the person towards the group?" I get that I don't make an effort in joining social groups in class but why do you care about that so much though? and where did the negative effect come from? I honestly don't get what's her deal. it's not like I did or said something to her, I don't even talk much to any of my classmates and I'm not really getting amazing grades either, so I'm confused rn, I'm not really into passive aggressive people. 

I skipped school again today.