Ok I need help!
I'm 18 and female. Next year I'm sharing a house with 4 other people (it will be my 2nd yr of uni). At the moment I hang around in a group of 10, most of who I live with in halls now. When it came to look for houses we naturally split up in groups, 5 on each side.
At the beginning i was quite happy with who I'm living with but I'm starting to have problems with 2 girls (the other 2 are guys and I get on really well with them). I didnt know one of them that well (we'll call her Mary) but I didnt dislike her at the time. The other one (Cath) I used to be good friends with.
But I dont know whats going on! Lately I've just been having clashes with both of them and im now dreading moving in next year. Mary is arrogant and rude to me alot of the time and nitpicks about everything. For example, she had a bad cold once and I was trying to be nice to her so I said something like "i hope you feel better soon" and the next day she twisted what i said and had a go at me. Apparently I'd said "i hope you get better" which she thought implied she wouldnt at all.

She was really rude to me about this and it annoyed me. What a thing to start an argument about! She also tries to intimidate me in the group and comments on everything I do (ie body language etc). Its so annoying.
Shes also very free in her morals and sleeps around. I'm the total opposite and next yr I'll have to have the room next to her which I'm worried about. In short she just really irritates me and I feel victimised by her.
Cath is good friends with this girl. She used to be close with me but lately shes just been irritating. Shes very highly strung and stresses out about everything. If i drop a pen or something on the floor and leave it, she'll have a go at me for being lazy (even if the pen is in my room!). I'm very laid back and now Im worrying. Whats gonna happen if i leave something lying around the house? She'll go mad. Im sick of her moaning and having a go at me for just being me.
I know that the other 2 guys feel the same as I do about Cath because she moans at everyone, but they love Mary - because she puts on an act and is very good at getting on with men.
I dont want to live with these girls next year but I dont know what to do. We've signed for the house (we did that ages ago) and I'm stuck with it. Its making me feel quite depressed

what do you think i should do?