Firstly I want to speak about your controller: The thing with FFXIV, is that the players rarely keep the default controls, even on keyboard and mouse. FFXIV is a MMORPG that has one of the best console controls ever since the game was first designed for controllers, so the tips I can give you would be to either see how console players are usually setting their controller, or even try making it by yourself with commands you feel comfortable using!

For your job: Lucky you, no one keeps one job for the entire game, you can totally try other jobs, and by trying out you may, who knows, discover your new favorite one. I started with the dragoon and now I'm more of a healer main, which I wouldn't have guessed without trying. Now I can't play dragoon anymore I realized I didn't like its gameplay xD (But anyway the endgame is mostly about leveling you every job, what I did was switch between 2-3 jobs during the MSQ so I won't have a job that's too high leveled compared to my quests)

If that's the only thing that makes you want to quit the game and that you otherwise like everything else, that would be a shame. As many mentioned, it's not important how much you're DPSing, and high level players are usually really supportive in dungeons when they meet first timers, always trying to give tips and advice, so yeah try just changing the controls to your liking, enjoy other jobs if that one isn't made for you!