Don't listen to anyone who says that people think tickling is childish and cringe, People tickle each other all the time and in part they do that cause it's childish and cringe. Tickling is fun, people love tickle fights everyone knows this.
I seriously don't get why people think that they're gonna get kink shamed over tickling out of all things. I've seen chicks take every chance they get to tickle there boyfriends and vice-versa. Woman tickle each other plenty and I've seen an alarming amount of grown-ass men get into tickle fights. Hell sometimes I've seen people go under shirts or into really invasive places like the belly button, and it's literally just casual platonic tickling. I've seen friends and acquaintances do it, and I've seen it several times in the wild. And when I see it, despite being a ticklefag, my first thought is "This is childish and cringe" because it is but everyone has a good time tickling each other. It's playful, friendly, and a good way to tease people (And all close relationships have some element of teasing) and is literally one of the most common ways to flirt or be intimate.
The worst case scenario is that you do find someone who loathes tickling and isn't willing to warm up to it. In that case you have really shit luck and the relationship isn't gonna work out either way. It ultimately depends on how you go about dating, but if you're both looking for something serious and really vibe with each other, even if they don't like tickling to begin with they're still probably gonna do it if they really like you. If you're really concerned you can just test the waters early on by tickling them and go forward if you get green flags.
I can not fathom how touch-starved, anti-social, and isolated you have to be to think you'll be ostracized by your partner if you admit tickling turns you on. By the time you're even ready to say that, you'll probably have been tickled each other several times come on touch grass and meet a girl already.