that my flatmate spends up to 12 hours daily in our kitchen? He uses it as his living room, fuck knows why since we all have our own bedroom and separate living room. It really irks me, because every time I need to use kitchen he sits there with shut doors, and I just feel like a wanker who invades dude's personal space.

Plus I'm a private/introverted person, I don't like small talking when I don't feel like it, and generally preparing meals is pain in the ass because he's constantly there and it's just not comfy.