Suffocating

Why can't people realize I need my own space?  The only space in this house where I can have a place with a TV and area to sit is in my parent's room.  I don't have any space but my dark, dungeon of a bedroom.  I have no where to invite people over.  When I had my own apartment I had people over all the time....I can't have anyone over.  To do what sit in my little sitting area in my bedroom...can't watch a movie.  The living room is always trashed or Zach and Amy are there.  I'm suffocating.