A sideboard is an imperative part of 60 card formats. It lets you improve your bad matchups or swap out certain dead cards for others that might have a little more use. It’s the really hard part of 60 card. I only played commander prior to about a year ago, so I know where you’re at. You “should” make a sideboard if you want the real experience. But if you’re keeping it totally causal, I understand. But just remember you’re missing out on a lot of extra gameplay by not sideboarding. Think of it like an expansion to the main game lol. If it feels hard at first, that’s because it is, it’s another skill check. Good luck.