honestly we live in a time and day when all girls care about is the size of a mans dick. My dick is 8.5 inches long, and girls find me attractive, so I have a lot of experience. An believe me penis size is pretty much there number 1 priorty. maybe hip hop, the 90's, but for what ever reason all woman have become size whores obessed about the size of mans penis. it matters 100% if your just gonna have a sexual relationship or a 1 night stand with someone. and it still matters in a long term love relationship, just sometimes the girl keeps her mouth closed. all the girls i've slept with have always been obessed with dick size and gossip about it with there friends. feeling on me before we have sex to get an idea.
btw your penis usually stops growing at 16 years of age, as well as your height, then you begin to fill out.
so if your passed 16 your probably done growing.....sorry but in todays world size matters, any girl whose says it doesn't is just being nice, and not trying to hurt the guys feelings..
I recommend you try some penis enlargements, because I'm sorry to say with 5.5 inches you just can't win, that's being perfectly honest with you man.