I just found out my family is staying WAY longer than was planned.

I'm on summer break right now after a year of constant stress and exam anxiety. I had basically zero free time (class from 8-5 (with breaks between but those were too short to go home or actually do anything, just an hour or 90 minutes here and there) and studying after and stuff) and was looking forward so much for my summer break to DO things. I had so many video games I was saving up, so many books I wanted to read, so many things to do and places to visit. I kept pushing up all my arts and crafts and basically any and every plans. I was ready to fill at least 4 weeks of my 6 week break.

The issue is my family is visiting from another country. It's basically my aunt, uncle and their son (my cousin, 14). In his country, summer break is 3 months, so he's already been on break for so long and is basically bored by now.
They came on the 5th day of my summer break. Initially, the plan was for them to stay for 2 weeks, but now they'll be staying for FIVE of my six week summer break. My aunt and uncle took my cousin's phone away (he spends too much time on it, that part's true) and are basically forcing me to entertain him because I'm all he has here. It's a foreign country to him. He has no friends here, can't go out alone (because he's too young, can't speak the language and can't navigate on his own properly), can't play any games (because he'd be alone), can't do ANYTHING and I'm so fucking burnt out having to do shit with him every day. Don't get me wrong, I love my cousin, he's my family, but it's way too much. Whenever I want to do something alone, I have to include him. Even when I want to go on a walk, he HAS to come with. He HAS to be included. Because he has to walk too for some reason. I can't go anywhere alone. I can't do anything alone.

I want so desperately to just be alone I've been looking into scraping some money together to book a hotel for a night or something because I just can't fucking do this right now but then again I can't do most of my planned hobbies in a hotel because I need my equipment and stuff.

I had SO many things I wanted to do and now three weeks of my break have already passed and I've done NOTHING. I'm so upset about this and it makes me cry and I don't know what to do.

My mother doesn't understand. She's a major extrovert and has never really understood my mental health anyway because she just hasn't lived with it yet. She literally said I'd get one "grace day" today to do what I want. ONE. DAY. As if that's enough to do everything I want to do. And I know she's trying to help but it just makes me so upset.

I was so excited for summer break but now I dread the mornings when everyone will wake up. I've physically changed my sleep schedule to wake up much earlier to have more free time (that I spend just staring at the ceiling most of the time because I need to decompress from doing shit every day) too and I feel so exhausted now all the time.

I'm not sure ANYONE will read this but I needed to just scream out into the void for a little. This isn't proofread and very rambly I know but I started crying writing this and I need to calm down a little. I'm happy to respond to comments, if anyone has anything to say. If not, it's okay too :)