So, I don't know if this is the kind of answer you were looking for but I'm gonna give it anyways.
I'm not attracted to girls, but I thought I was for a long time, for lots of reasons but one of the main ones being that I didn't know what Attraction.tm felt like. When you look at anything there's always a million feeling swirling around and it's your job to name then and some are easy (like happy, sad, angry) and some really really arn't and so I find tend to try and find like indicator flags. Things that the feeling makes you wanna do, and consistently do every time. So for me, if I'm attracted to somebody I want to touch them on their back, dont know why, i know thats weird, but it is what it is.
And that's really the only advice I have on figuring all that confusing stuff out other than take your time and be kind to your self, oh and there's no point staring at pictures of girls and then thinking about kissing them and checking to see if you're turned on, because, fun fact, if you think about being turned on, your body will start getting a little turned on.
I hope this helped at least a little, good luck!