What's preventing me from identifying as a lesbian

So I haven't had any experience at all. Mostly because the only people I've liked were both teachers (both female). I dismissed those crushes at the time, and continued my adolescence assuming I was definitely straight - especially since the school I went to was more homophobic than other schools and nobody was 'out'. All of the girls I hung out with were always lusting after boys and making silly sexual jokes involving themselves + a guy. Despite joining in this boy talk, I always didn't really understand why they cared so much. And the same goes for my sister and cousin(who I'd hang around with a lot whenever we met up,) and both being slightly older than me, they got to the age where they could talk about boys for literally hours and I had no idea how they could do it. I could appreciate a good-looking guy, but that was it. I've never felt like I wanted to get close to a guy, real or famous or fictional. But some women, yes.

Yet I hear gay women talk about how they're attracted to pretty women, boobs etc. but I don't get it. I can't look at a girl and think 'yes' because I absolutely HAVE to understand more about them before I can be attracted to them in any way. Appearance does factor into the equation - because I'm into women on the more feminine side - but they also need to be intelligent, funny and extroverted (probably because I'm so introverted and admittedly their enthusiasm is such a turn on). Attraction seems to happen very slowly and I don't think I've met anyone else like this.
How common is this? Or is it just my inexperience making it difficult for me to appreciate women fully?

 

Thanks this is all very helpful