The -girl- -friend- never the -girlfriend?

Well to be honest in my opinion i have found that when you have a really good friendship then try to pursue a different type of relationship it never can go back the way it was before. So maybe these guys see you as like a best friend u know? But if you are really interested in someone inparticular then maybe you should directly ask them one day if they are interested in you like that. May feel awkward but maybe u need to be the one to start up that conversation to see about their interests in you. Have courage and just be confident sounds like you will do fine seeing you know them all that well. Good Luck...