I saw a video of someone teaching himself to like celery, and coerced my girlfriend to do the same - it works!
You literally just start by nibbling a bit every day and start eating more and more as you can handle it. She loves celery now, to the point where she just eats it raw as snacks.
Whether it's worth the apparent torture is up to you. To be frank, picky eaters give me second hand embarrassment when out dining, since you can teach yourself to like basically everything. Usually it's just people who didn't get much variety as children.
It's Tara Reid, if that's what you're asking