I have literally no privacy!

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I'm with my dad everyother week when in there I share a room with my step sister which is fine but her staring while i change making me uncomfortable isnt. When I'm there I dont have a bed I sleep in a sleeping bag on the floor. Also on week days I am woken usually before 10 and asked to get out of the kids way. My dad's company is ran out of our home and the girls who work theres kids come with them and play in my room all day. I have to pack up my bed and move it every morning for them. Not only that but they get in all my drawers and use my things without asking. Which is very annoying. The room is always a mess when I come over and I always have to help clean it and it's never my things. I hate my room being messy and I always put my things away. And each day when the kids leave I have to pick up their mess. I'm so tired of doing all this while taking care of the kids all day without so much as a thank you. My mom's said just don't take care of them it's not your responsibly but if I don't do it the babies ( theres 2 of them) run around with a pooppy diaper all day and I can't stand to see that. I dont know what to do. Its honestly to the point i dont see a point in going to my dad's anymore. He barely even talks to me he pretty much sleeps all day.