My advice (and feel free to ignore it): Stop focusing on looking for a woman who likes tickling like you do and start focusing on looking for women who you click with. Go out and socialise, join interest groups, sports groups, book clubs, what ever you enjoy. The more you get out there the more chance you have of meeting someone (it might be a cliche but it works).
I know its unlikely that you'll meet a woman with a tickling fetish but so what? You'll have a good chance of meeting someone who likes you and is willing to explore tickling. Unless someone has a real dislike of it (and if that's a red flag for you, don't go any further with them) I think most people are happy to indulge their lovers with tickling, and some even get really in to it 🙂
In the two relationships I've had in which tickling was a big, big thing I was the only one with a the fetish for it, but both of them ended up loving it. Tickling is fun! Its not like people without a fetish don't do it anyway.
You may have to adjust your expectations and take it slow with them and not freak them right at first with the more hardcore side of it. But this is all something you might have to do anyway if you do meet someone who has the same fetish because it's still quite likely they'll have different needs and wants to you.
(This is all assuming you aren't already in a relationship, are looking for one and not just a play partner/tickle toy, in which case, some or all of the above might not apply).