Is maining just not for me?

Hello, i am pretty new to this game and when searching for tips on how to improve I pretty much always saw someone telling me to main a champion. I would really like to have a main champion but I tried out most of them now and I believe there isn’t really one that I really like. The champion I liked the most so far is ambessa. But I want to play jungle since I don’t find laning(except maybe toplane that’s why I tried her because I thought she could do both) to be that fun. But she is really bad in jungle(even tho she is somehow considered a jungler). When playing a specific champion I just feel like I don’t want to play him anymore after a few games. But I can’t just swap champs every few games because I will not improve like that. I also don’t want to blame bad performance on a champion. This is probably really confusing because it literally doesn’t make sense but maybe some1 knows a tip how to fix that problem?