Ok I'm not going to pretend that I know much about this, (because obviously I don't) so I'm going to try to explain this the best way I can.
Natural Selection is theory of genetics playing a part in an individual being able to survive, adapt, thrive, reproduce, etc with more success than others.
Charles Darwin came up with this theory. (people obviously know that lol)
Basically people are born naturally superior to other people. (looks, talents skills, smarts, etc) If you don't have at least some of those qualities and can't survive, and or adapt, you get "weeded out" as they say. (in everything; dating, jobs, friends, etc) Basically survival of the fittest.
I'm trying to word this the best way I can and I know I sound like an idiot, but please, bare with me.
How this ties into love & dating is that most decent-looking women go for the men that are "fit". By that I mean men that have some (most) of these qualities; good looks, smarts, charismatic, strong-minded, educated, mentally tough, financially stable. Have these qualities also shows that men are able to (or already are) survive and thrive in their environments, (dating, school, work, life in general) things I guess women are instinctively attracted to.
I think this supports my past saying that I had been destined to end up the way am today when I was born. As I lack any qualities that would allow me to thrive in anything.
I'm not good looking, smart, charismatic, or mentally tough. I don't have an education, (dropped out in ninth, while in special ed) I'm poor, slow, and my social skills aren't that great. I can barely bathe and take care of myself. Surviving and adapting is a lost concept to me. As a result I'm 25 and I haven't had so much as a phone number from a girl/women that I was interested in.
I think I already may have been "weeded" out. I spend my days now as a depressed, lonely, bitter, and suicidal hermit who does nothing but play video games and watch anime and porn. No friends, dates, job, and I'll probably end up homeless after my grandma dies. (If I don't die from suicide first)