Why is there a pit, a hole, in me... that want's someone's love, and not just anyone's, but some specific person that I don't even know yet? why am I, no, why are human's, us, in need of some, stranger's love and attention?

Well everyone's needs for love and attention are different. It can depend on how you were raised, if you received a lot of attention as a kid, etc. Humans are social creatures so we already crave human interaction. and, going back to how you were raised, even if you were raised quite well and you got enough attention as a kid, it really depends on how people treated you and maybe how many times you've had your heart broken or something along those lines. That need honestly varies from person to person. But I know how it feels, you'll get through it, you'll be okay.

It is evolution, because we all have some of the same traits like eye color or shape or ears.