Friends

Hi, i have a large friend group made up of 6 of us .. all different personalities and some alike in ways .. we struggle to stop fighting or dissagree on different things .. if 2 people do something without others there is fighting .. currently there is a girl (a) in my group who hates another(b) because of a boy .. i see where she is coming from but still it is a bit unnecessary.. it makes me feel uncomfortable as when i spend time with (b) (a) gets narky and frosty with me but i feel like it is pressure to keep both of them happy ... i really dont know what to do anymore im sick of it all and i am in a really stressful year in school .. for me i feel guilty when im having a good time as this hangs over me when i spend time with some of the girls ... someone tell me what to do