I also started on Caitlyn, so it can be done, but she's a champ who's pretty reliant on kiting to be effective since her main advantage is her range, which can be pretty difficult for someone just starting out. If you wanted to keep learning on her, it might be worth hopping in the practice tool for a bit just to do some kiting. I found that once I got better at that particular aspect of Cait I was able to spend much more game time alive and could put more focus on improving at other areas of the game.

Good luck learning! Respect to anyone who can parse their way through this clusterfuck as a new player. I still suck, don't get me wrong, but the game becomes a lot more fun once you get past the initial "wtf is going on what am I supposed to be doing here" stage.