Help nosey people at uni always up in my business?

im at uni and my housmates r sooo bloody annoyin!!!!!!!!!! they are so nosey they stand outside my door and listen to my fone convos and when i go out ask were im goin!!!!! its not in a friendly way its in a parentish way!!!! i have my own friends they are just people i live with!!!! ergh they make me sick how can i deal with this without getting rude, what should i do????