I can't play with a controller

Hi. I have no idea where to ask this so, this place seemed the best fit.

I've been a gamer since I was a kid. I have played all sorts of games, from truck simulator2 to FIFA/pes to games such as RDR2. I have ever only had a pc, and all my gaming has been done by a keyboard.

My workplace bought an Xbox, and in order to get better at FIFA and beat them, I finally bought a controller at the ripe old age of 24 to practice it (it felt virtually impossible to play fifa23 with a mouse and keyboard, we've obviously moved a lot from the first ever game I played, Fifa08). I can play FIFA with a controller alright, but I can't really seem to get the hang of using a controller in a game such as RDR2. Everything feels unnatural, the fact that I could control every movement with a mouse but now I gotta control 2 analog sticks and use both hands for shooting, etc feels outright weird. I simply can't get the hang of it. Am I missing something?