Okay, Tom...
Getting 3A out of the way, because, in the end, it's a non-starter, let's discuss 3B. It's NOT the end of the world. At the start of the relationship between The Mizzus and I, she hated and feared being tickled. I'd be into it, and if it went longer than five seconds, there was terror in her eyes, and she started screaming at me to stop.
Now, we play.
You actually have the power to change her outlook. Rome wasn't built in a day, though, if you're patient, and you're gently persistant, you can actually get the girl to actually play with it. It also depends, of course, on how she feels about YOU in the end, how committed she is to both you AND the relationship, but it IS possible.
Don't give up.
Yeah, all the good advice, plus this!
It's sadly about percentages. Everyone has their likes and dislikes, and needs and wants, and factors they expect, which knocks down the percentages of success.
I know a guy with a redhead fetish. That knocked out every blond and brunette for him.
You look at the female population (or male, for women) and you start at 100%, and start decreasing the numbers. Most people only have about 10% to 20% to work from, and some have even less. The more demanding you are, they lower your numbers.
Some people, like my soon to be ex-wife, and her whole family, are so spoiled and demanding, they are happy with NO ONE. They have great husbands - and treat them like shit.
Don't get to that level.
I understand where you're coming from, but don't be so hard on the ones who aren't ticklish. Their still people, and looking at them negatively isn't cool for you or them. Some people just aren't ticklish. They were born that way, it's not their fault.
Some people hate to be tickled, but have to be converted to like it, which is a long process, but certainly is possible, as those here have attested.
Good luck. At least you're still in the field. When my divorce is over with....I"ve given up. The only thing I've ever wanted to be was married. I didn't even get to the level of finding that girl who is ticklish, or further, respected me, my dreams, friends, on and on. Now, the only thing I want to be is not married.
I'm at the point of seeing so much more in a healthy relationship that so many have mentioned, that you need to look at, past the fetish phase. Does she respect you, not lie to you or demean you, does she respect your friends, or just rudely walk away when you meet one in the store like mine did, does she respect your family, your politics, your faith, your dreams, etc?
Good luck, I hope you return one day with a post about finally meeting the right one.