first, dont listen to chicks about chicks. theyre full of crap.
also, its super important. i try on different personas when im out and about (funny guy, nice guy, angry guy, agressive guy, sexy guy etc) and when youre confident, you lead the convo and ultimately control the outcome. i used to go out with a guy who was super good looking, but without any confidence, and he used to get nothing. NONE. girls would like him from afar, talk to him, and be turned off. meanwhile i would zoom in and have a girl within a half hour and he'd be saying WTF
i loved it