?

I'm 20 and i can say that i dress really well, i get a lot of compliments and well i'm pretty. I'm not very social, most of the time when i'm in large groups i get quite due to my social anxiety. The thing is, i come across A LOT of girls that seem to not like me and i don´t know why because despite my shyness i'm really nice. I don´t know if it´s because i intimidate people or something. It´s really hard for me to make friends especially girl friends and i just want to know why. i hope i didn´t seemed cocky in the begining cause actually i have a low self esteem.