I used to feel envious of people in relationships before I was in one
Why did your relationship views change?
I feel in a relationship you can't be yourself and you have to have a nice personality
Relationships take a lot of compromising, but you shouldn't feel like you have to change who you are to stay in your relationship. Does your significant other know how you feel?
Maybe. I'm not really sure.
I think you should try talking about it. Just let them know you need to be yourself. If they like you, then fine-if not move on.