I hated lettuce and tomatoes. I still don't eat fresh tomatoes, but I don't mind them cooked into casseroles.
Now the lettuce is a different story. In high school I was on a local TV show with several other girls, and the station took us to lunch afterwards. We were all served a small steak with mashed potatoes and a SALAD! When I looked around, everone else was eating her salad, so I forced myself to eat mine, not wanted to look different. Later, when I got home and realized that I wasn't going to DIE from eating lettuce, I realized that it hadn't been so bad after all. Gradually I started trying a little lettuce here and there, and today I love it!