I think few people consider the fact that:
1. The person you share with will be human, generally, and hence they will also value privacy. There will be a general understanding of this, and say, for example, you were undergoing great stress maybe due to relationship issues or something, they would quite gladly leave the room for you to be alone for a while, etc. As I say, they're human too and would expect the same from you
2. The person you share with will have at least some of the following: lectures, seminars, tutorials, sports, committees, clubs, societies, friends, social events, jobs, relationships, etc etc. And so they will not be in the room 24hrs a day, I can guarantee there will be plenty of times you will come back to your room, see that it's empty and go "Ahhh, how nice, a little bit of time to myself"
- After a couple of weeks you will actually get used to your roommate's timetable and know when you get a bit of time to yourself
3. The person you share with will also have interests, which may conflict with yours yes, but this is the point of sharing. It's not to battle it out with you playing your guitar as loudly as possible whilst they turn up the volume on one of their classic war movie DVDs....it's to create an understanding that at certain times certain things should be respected - and this is not a "I hate that girl, such a bitch, I want to play my guitar" thing, but rather a "Oooh it's Classic War Movie night, I've never watched these before but I really enjoy them now, and tomorrow night I'm playing my guitar and teaching my roommate how to do some basic stuff on it" thing.
4. The person you share with is at Durham University. I'm very sorry to let you down, but about 99% of students at Durham are intelligent, civilised, interesting, funny people. If you get lumped with the 1%, I'm sorry, but this is very very very unlikely...and they'll probably realise Durham isn't for them and leave within a few weeks and then you'll have a double room to yourself (yay!). But otherwise, yes, the person you share with will be someone you'll really end up enjoying living with - and whilst I agree that I didn't "enjoy" sharing so much, it was perfectly fine and I learned a lot from my roommate, and I believe he learnt stuff from me (i.e. how to tidy up! lol). But I know that many (I'd say 60-70% of people sharing) ENJOY the experience and many go on to share for another term. In my 2nd year I lived in a house with the guy I shared with for a term in 1st year in college
5. I'm not having a go at you personally, lol, I just want people to realise that you're not going to get lumped with some charva who's brought his own strobe lights (ahem, I do know one guy who in 1st year brought a strobe light, but anyway...)....is going to play rave music until 5 in the morning, bring all his mates around to trash the place and beat you up. In fact it won't even be a teeeeny fraction as bad as this. The worse you could get is snoring, untidyness (or cleanliness if you're the untidy one!), maybe smells, and yes there is that tad lack of privacy....but trust me you'll never in your life again enjoy going to the toilet!! (Sitting down and just breathing a sigh of relief...lol...not for toiletness but just that you're alone for a bit, hehe!)
Sorry, long post, but I've had a long day without internet and my addiction needs to be fuelled