My right eyebrow is lower than my left eyebrow & it has more eyelid skin. What can be done to fix it? What causes it? (photo)

It looks like I'm raising one eyebrow, but I'm not. I’m extremely self-conscious about the way I look. I can’t afford to get anything done, hoping one day I'll be able to. I was never the "cool kid" in school & have always had low self-esteem. I look at my pictures when I was a kid & my eyes weren't like that, so if people thought I was ugly then, I can only imagine what they think now. I just want to feel pretty, but unfortunately can’t afford anything & don’t think I’m ever going to be "pretty". What can be done to fix that? What can cause it?