Well, first off all if theres any champion you are good with, you should roll with that.
Other than that, there will always be stronger champions. If you're playing on a team, I'd suggest you find out what kind of playstyle you want. Wukong is great for teamfight oriented compos for example.
You need to find out what you want. Its all about having fun, and if you play something you dont like you're not going to have fun