No, you misunderstand.
You were talking rejection and positive/negative. I was telling you how I stay positive against often difficult odds. Imagine online dating where you have a very engaging, mutually positive, highly stimulating interaction with around half the girls you open.
My number close rate is usually higher than 10%, to put your "only 10% of girls are even available" statement into perspective...
If I decided to start hitting on girls in your gym, I'm very confident it would go down well a lot of the time is what i'm saying (don't care how unapproachable you think they are). Even when it goes poorly, you just pick up on that and eject in a face-saving manner - but that's not something I did too well starting out, and why it's really best not to learn somewhere confined and in a venue that you value such as the gym in the first place.
Literally anything social-circle. I've never had a decent mixed social-circle in my life that I can remember not getting a girl (or unwelcome attention somewhere like work, or other guys girlfriends, or whatever). Social-circle is the easiest by far ime.
The reason I think being you don't have to change much about yourself.
If I were you, and all I wanted was a simple boyfriend/girlfriend relationship, not rock the boat or anything, and I was starting from complete scratch, I would start with joining a bunch of populous meet-up groups. If you don't have a girlfriend by say Christmas, then you really need to take a long hard look at yourself.
No offence, but you've gotten a tonne of advice, and had the game sort-of mapped out. You seem keen to talk down any typical way of having a decent amount of women going through your life. Which tells me that you're more interested in rationalizing your current position, than making any serious changes to it.
It's really on you now. You can lead a horse to water, but you can't make it drink.
Good luck with whatever you decide, fella.