More specifically talking about groups consisting of boys and girls where the boys can act as 'competition' even when they are your friends. I get the impression it is more difficult for me to maintain attention of the girls. Sometimes they don't even listen when I'm talking. Can my height have something to do with this (I'm 5'7'' aka 167cm)? My friends are usually longer. What is the best way to stand and to talk? For some reason I'm not having this problem when approaching one girl on my own, but with multiple people all these insecurities come out of nowhere.

Thanks!