I've been messaging a girl who is much younger than me, and i'm just being my usual self as I don't know where to start with 'game'. I guess i'm just naturally fairly 'nice'. I give compliments. Try to make her feel good etc. I hear that being 'nice' is a death sentence and i'm supposed to be cocky/use negs etc. However, this girl is eating it up and I know that I could get her to do what I want. She's called me 'nice' a few times, but she also seems to really be falling for me! In fact, it's getting a bit awkward.

She is only 17, but she seems like a very young 17. I'm well into my 20's!

Is this just basically a lucky one-off and in general being 'nice' is NOT the way to go?