Now if you’d asked about depression you might have got some more sympathetic answers.
That said you are in a shared house and that is going to press buttons for you and there is only so much ‘give’ you can expect from the other students. Telling them is still and option but I still think that a lot depends on your relationship with them.
OCD tends to make us shy away from the difficult/painful and fearful feelings, I think that that’s one of the reasons (like phobias) that it responds well to CBT exposure type therapies. You could use the situation, if it’s bearable, to work with someone to try and get a bit of a handle on the OCD and make improvement. Whether that’s something you feel able to do now, alongside study is your call, it might be too much.
I would think about exploring options for therapy, in my experience OCD doesn’t just go away and there’ll likely be something that you find difficult throughout life; it might be your housemates now but it could just as easily be work colleagues or something else later. It is possible to make suprisingly big changes.
— edit —
Should have added, as with all things ‘mental health’ riding the bike is great therapy!