How is it that I just know what to do?

I don’t watch romantic movies, or read romantic books, or anything like that, and I’ve never been in
a relationship untill now, so how is it that I seem to just know what would be a good thing to do

I’ll give you an example.

My new GF wants me to kiss her, I’ve never kissed anyone before, but somehow I had a plan that
seems good.

I would do the usual that we do, hanging out for a couple hours after school. Hold hangs, hug, whatever. Then when her bus comes by, before she goes to take it, would grab her by the small of the waist, pull her towards me with a gentle squeeze, give her a quick kiss, and then walk away asif nothing happened. By doing this it seems like it would not give her a chance to say anything or get another kiss, so it would leave her wanting another one, and the fact that she would have to wait a whole day would kinda, idk, build the passion up a bit. The person I talked to said it was a good idea.btw, what do you guys think of it?

How do I know to do something like this instinctively? How do Ijust know what would work well and what wouldnt’?