I have found many who are considered beautiful, completely unattractive and vice versa, handsome ditto. I have also seen that some are very beautiful to look at who become ugly within a few minutes of speaking. Beauty doesn't only mean humans though, there can be beauty in many things, and if you learn to see beauty you will find it, if you expect to find ugliness you will find that too.
Having grown up with a sister who everyone we met found stunningly attractive I felt I was not. This was reinforced be two partners and even my mother who would introduce us by saying the pretty one is Barbara and this is Annette( my old name)
I hated mirrors
I expect there are many out there who have a distorted view of what beautiful is, and of their own attractiveness and of course there are cultural influences too.
But remember you can have a beautiful soul, a beautiful mind, but it won't get you past the doorman at an upmarket nightclub,