This was me for a long time. I just didn't have an appetite. Didn't matter what was prepared at home or what I got out elsewhere. I'd take a bite out of something and be done. It got a lot better in middle school but up until then my appetite was fairly small.
Also your likes and dislikes can change during your lifetime. I used to eat salmon patties my mom would make when I was a younger kid but for quite a while the thought of eating salmon is like
and I really don't like seafood. On the flipside now I like edamame, hummus, coconut, goat cheese, squash, broccoli, broccolini, asparagus and more all these things that even until college did not at all appeal to me. I love herbs and spices things that I didn't use to seek out.
One of the only things that has stuck with me all the years of not liking is cantaloupe and that's because an in-home daycare provider from my elementary school days would basically force feed me that stuff (mostly the clean your plate mentality but just more forceful) and I hated it, still don't like it at all. Bad memories=bad taste no matter how I've tried to overcome that. I like honey dew instead but most people I know dislike honey dew and like cantaloupe lol.