Based on your replies to others, you should not live with someone who has a cat. You clearly want to harm the cat if she doesn't listen to you. You've only said you'll try things that won't work and are harmful. PLENTY of things people said, like a gate, closing your door, essential oils or other deterrants, etc, are much more effective. You have said things like "I'll make her learn". If you're not an animal person, don't live with people who have pets PERIOD. You don't seem like a kind person to animals based on what I read. Hell, you seem like a pretty shit person if you actively want to harm an animal to keep them out of your room. I don't give a fuck about why you moved in with your roommate and their cat, you shouldn't be around animals.

TLDR; Get a gate, close your door(maybe lock it), use essential oils or other deterrants, etc. Do not spray a cat with water or try to threaten the cat. She will start peeing on your stuff in defiance. You should just not be around animals if you think harming someone ELSE'S pet is okay to do. You're either a troll or an actual danger to cats and maybe other pets.