Too many people confuse being nice and being a fucking pussy.
I'm the sort of person who will bend over backwards to help a person out, most people who know me would say that nice is an understatement.
But I'm not afraid to stand up for myself and I'm not afraid to go after what I want. I'd never try to step on someone's toes or take advantage of someone to get what I want but I won't be a pussy about it either.
Sorry... I just got this same question from my brother in law.... who is a pussy.... it doesn't matter how nice you are if you don't have the balls to go and introduce yourself, ask for the promotion, or go after your goals... then it has nothing to do with nice and everything to do with being a coward mother fucker with no spine.