Jen, welcome to TMF. First off, the members of this site are so diverse, that nothing is "weird". I have an alternative interest of liking to see barefoot girls on ladders, so people here know I'm a little different. That having been said, I'll return to the question you raised.
I have heard of situations where people enjoy being turned upside down and tickled. Tickling can have many different positions. Iam sure that somewhere, you will find a guy who will be accomadating to your particular interest or fetish, and you will be able to explore that with him.
So, to summize, is your fetish an alternative version or extension of tickling, yes, as my fetish of ladders is an extension of my other fetish besides tickling, feet, because I think I like to see bare female feet up high. But, to answer the question you posed if you are "weird", no, most definitely not. You have found a place where the members have diverse variations of a couple of broad general fetishes, usually tickling and feet. People are accepted here, and you will be able to discuss and explore your fetish. Hopefully, either through the TMF, or a personal, you will one day locate a guy who shares your fetish. Welcome, and enjoy, take your place amongst all the other alternative fetishists who belong to this site, a place where we understand, support, and accept each other, but are probably all a bit "weird" or out there, to people who dont understand our fetishes.
Mitch