I'm quite shy, but people seem to like talking to me. I presume it's because I'm happy to listen to them chatting and am always sympathetic about problems because I know if I had to talk to people rather than them talking to me I'd find it harder, so I don't want to put them off iyswim. I do end up being told about relationship problems and fallings out quite a lot though 
About a year ago I joined a group where there aren't many new people and we haven't really stuck together. I may as well tell you, it's partnered dancing, so the others have joined in with the friendship groups their partners are in. My partner doesn't really do the social side like I do (much longer hours than me, so he leaves straight after classes/practice while I'll hang around and go for a drink or something to eat afterwards) so I've 'gone it alone' a bit, talked to everybody and made quite good friends with some.
What I didn't realise at first is the group is massively clique-y. I've chatted to people from all the different groups and have found most to be very nice and they all seem to like me. But they don't get on.
I hear the same story from all different sides, and to be honest I'm finding it exhausting and a bit silly. We're all grown-ups for heaven's sake!
It does worry me though. Am I so nondescript they just miss out on the fact I talk to everybody else? And if they realise this, will they regret having spoken to me in the past and told me (some of them) some quite personal things?
I don't want to end up with nobody speaking to me because I've tried to be on good terms with everybody before! But, I also don't really want to join a clique and have half the people not talk to me because of that.
I did try standing up for one person I'm friendly with when I thought the others were being unnecessarily bitchy about him, but it hasn't made any difference either way. They still seem to like me and dislike him 
I'm probably being too cautious because I don't want to burn my boats. The people I'm most friendly with are a couple (dance and relationship-wise) but I know I can't just hang around with them all the time because I feel quite a third wheel and I'm sure they don't want me there all the time either!
Do I just need to accept that in becoming more friendly with some, I'll have to become less friendly with others?