How are guys attractive?

like to a straight girl.

im a guy. i understand that i find some girls really attractive and i can love them. but then i think abt it. why does she like me back. what is it about me. i dont find guys attractive so thats prob it. but like i always think she doesnt want to kiss me and all bc im not attractive etc etc

or like my best girl-friend earlier said i look cute with glasses
like exclaimed it
and this confuses me. attraction weird fr