While the game isn't exatily overpopulated with women, plenty do play. Don't let him tell you that being a girl will slow you down.
But don't think it will get you special treatment either.
Read the FAQs, browse the forums, goto a game to check it out. Nobody here hands out step by step instructions on how to get into airsoft, you need to make those yourself. Personally I spent about a year in the forums and talking with a friend who played (you know its you Prowler
) Then i went to two games, people showed me their gear, I spent another few weeks picking out what I would need to get started, bought the gear and just showed up at the next local game.