You don't confront them. That will just tick them off. Instead you have to learn to coexist. In the mean time you can toy with these people who find your life so much interesting than their own. You can either boast about how wonderful your life is or take the opposite route making you seem more pitiful than your nosey roommates. You could even start asking them for loans every time they show up where they are not invited. If there is one way to make people avoid you, that is to always ask for money.

Ask for a group discussion on rules and respect between housemates. Establish the use of the bathrooms, kitchen and common areas.

Confront them and tell them if they don't learn to respect your bubble, you will make their lives a living hell. They won't listen. When they don't, go buy a can of pepper spray and proceed to spray everything they own and all their food. They'll shape up.

the corporate look.....look at your watch, I gotta go....gotta see a guy about a thing

kick them out

I live in a house with 3 house mates and two are very extremley nosey and it gets under my skin , I cant even walk out the front or back door to leave the house because either of the two pop out their bedrooms as soon as the doors screetch I have too be ony tip toes when leaving the house and I dont cook during the day because one of the two follow me into the kitchen watching me cook and that bothers me and one is starting to think its ok to use my bathroom when he shares his own with the other guy! I share my bathroom with my housemate and I have no probls with him so why is, the other one in my bathroom!! Then they get mad when I confront them and tell the housing people im violatng my lease its annoying