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You have posted several times about having a private room and being uncomfortable when guests are in other parts of the house. You can reword things, you can put signs up in your house, etc. You can confront them. Walk in and say “the kitchen and laundry is off limits to guests, please stay in your room except when entering and leaving the home.”
However, you can’t control other people. What you need is either a separate entrance for guests or you need to put a lockable door in front of the entry to the kitchen or laundry room. I don’t know the layout of your home but think carefully about how you can do a modest remodel so that you can relax and enjoy your home again.
You can review previous suggestions at these links: