I think you're just really confused and hopefully you can have a deep talk with a counselor or therapist soon. Being yandere is just toxic behavior and a person who is mentally unwell.
If you can't let your partner have any freedom of their own in the name of love then you should not have a partner, ever.
What you read in mangas/manhwas is not what happens in real life. Get help soon.
Yeah..ik right? It's been since I was little.. I'm too afraid to get make fun of me..I been holding back myself and didn't dare to open up to anyone.. until I saw this..the worst part is..most of my love one is cheating on me..I just can't take it anymore..and it hurt like hell..ik I sound like corny kid or whatever is it..I do love them so much that I been end up in the hospital..so..I just want to change myself..
My tip is to stop putting ... After every five words. That will help. Then talk to a therapist. Maybe even chat gpt if you tell it u want healthy relationships.
I'd never recommend chat gpt for therapy before but you seem like you have no other options. But meanwhile Read healthy stuff. Make friends with normal people. Socialize, shower, eat and sleep well. Find hobbies. Get a job. Clean your room. Do exercise. Drink water. Do all those and you'll get better.

...I kinda wanna clear myself.. like.. about Yandere.. I'm a Yandere..yeah it's kinda embarrassing but yeah..I wanted the this that I love to be mine and mine only..the thing that I want to clear myself is if I'm Yandere..then why am I love Yandere people..I mean like.. Yandere people should love someone who's not Yandere right? (English is not my first language..sorry for making it hard to understand..I don't know how to explain it) ╥﹏╥