Keep practicing. BUT, if you have it, you have it. You can't just go out and get skill and style, you gotta be born with your own. If you don't have it from birth, you're going to go out, and imitate somebody else's image!! I've met rappers who come out of the woodworks, that didn't know they could rap, they tried it, and they're phenominal. On the other hand, I've met cats that went out, kept practicing, dropped albums that were trash, had a bunch of "YES MEN", and they continue putting garbage out!!
So, for your own sake, and for the sake of others, just keep practicing, and surround yourself with people that either dislike rap music but appreciate it...or people who love and understand it, that don't care if they hurt your feelings or not!! The more people tell you that your music is not up to par, the better your chances are of becoming tighter, because people love proving other people wrong!!