Why do I find beauty is everyone but me?

I hardly find someone ugly. I recognise many people aren't my type but when I actually see someone people describe as ugly, in most cases I don't find them ugly at all. It's just very hard for me not to find a good feature in someone. Then, why can't I like anything about myself? There is not one thing about me, physical or not, that I appreciate. I'm so tired and I wish I could see myself as I see everyone else