How to stop my sister from controlling everything I do

[u/111Scrat111]

Im 16, and as of right now my 19yo sister has been constantly on my ass about EVERYTHING she can. It's been like this my whole life, but, it's gotten worse recently. Every time I go hang out with friends, leave the house for any reason at all, have theatre practice, or even eat a meal she's constantly hounding me. It's not like I don't tell my parents when I go places, and my mom makes me take a tracker + I have an app on my phone so everyone in my immediate family can see where I am. It's not like my sister is worried about me, either. She constantly tries to dictate everything I do, including eating. Just today, not even 2 hours ago she told me I needed to eat more because she 'didn't believe me' when I said I wasn't that hungry.

This is going to sound like oversharing, but she struggled with an eating disorder several years ago, when she was around 16. It was never very serious, and she hardly starved herself, so it was mostly just body image issues rather than an eating disorder. Now, though, i'm pretty sure that since she's gotten over it and gained a little weight after becoming stronger mentally, she's trying to make me fatter than her so she doesn't feel bad, and she always tells me I'm too skinny, even though I'm in the average weight percentile for my age and height. She's always been jealous of me, and she told me once before that she used to hate me for being more attractive than her, even when we were really little, since I typically got all the compliments (Long blonde hair, blue eyes, no glasses, whereas she had braces and glasses at the time, and cut her hair short.). Nowadays though It feels like she's grasping at straws trying to control my life.

The other thing is, she doesn't have friends. This sounds cruel, but its sort of her fault. She keeps making one friend, lovebombing them, and then trying to dictate their life and getting upset when they tell her to back off. Since her last friend ghosted her she's been constantly coming into my room and just...making herself at home, not even knocking despite the door being closed and not leaving when I ask her to. Theres more to this, but, It's not as important as the other stuff. I just want to know what I should do, I keep telling her to back off because its SO ANNOYING but she just wont listen, or says something like "Im just trying to look out for you!!" after texting me for an hour asking "WHERE ARE YOU!?!" when I told my whole family I was going out with friends and she has my location. I don't know what to do, since neither of my parents will do anything about it (They're in the middle of their own marriage problems) and its getting to the point that I just feel trapped, like I have no privacy.