If you have this feeling for ONE girl, it may be love or infatuation. If you have the feeling for many girls, you're just a randy young man.
I have this feeling when I see a girl, my heart actually feels attacked. Idk if it's love, but idk it's just my head?
Could be anxiety. Anxiety can make a person feel like they are having a heart attack.
Doesn't sound like love at all, just lust at most. And you replied that you aren't aroused, but it's probably a subconscious thing. So your brain gives them attention naturally, you can't help it.
Oh yeah this doesn't happen with my sister or cousins. It just happens with certain girls.