Is it normal i think i'm unattractive even if a lot of girls like me?

I never look in the mirror and think '' ew I'm so ugly '', most of the time I just think '' meh, nothing special '', but I really find it easy to get attention from girls and I've been with several pretty girls, a really hot 42 year old woman and a pretty 29 year old girl included ( I'm 20 ), and it can't be because of my confidence because I'm really humble and I come across as a nice guy, I'm even shy around hot girls.