Don't rely on it...
Sure, it's another avenue to explore if you're willing to pay, or if you decide to join up to a free one, or one on a trial period... but it is no replacement for the social interactions, and pickin' up a girl from your study course, a girl in the club, girl on the street etc etc
So, by all means, be a member if you don't mind payin' and have some fun with it... but make sure you're still goin' out and gettin, or attemptin to get with girls in a "real" environment... why limit yourself to the small selection of girls who are online? You sound like you're relyin' on it to find a GF
Also, a lot of the good lookin girls on there are simply pretentious and go on there for an ego boost... they have some guy who is payin' membership fee, contact them or rate them, then use that confidence to go out on a Saturday night to go for the guy who's actually there, and they really want...