Nope, I'm not nice, I am actually rather awful as a person.
What's more, I am very comfortable with that and I hold myself in high regard.
I am lazy, conceited, I lie through my teeth when it suits me, my thoughts are really quite nasty, I judge people, I have no patience for them, I am not interested in them and their lives.
I have friends because they amuse me, they keep me from being bored. I'm also charismatic as hell, can charm just about anyone if I want to, and talk them into lowering my workload.
I do 'nice things' though, for social kudos. I don't think I'm a monster, certainly not a psychopath (I do feel empathy. Sometimes. I feel sorry for people but only when something Serious happens, death of a goldfish just makes me roll my eyes). But I am pretty damn selfish.