I was in a very similar position not too long ago.
They can definitely be inaccessible at times. If you want to give the genre another chance at some point, I would suggest identifying one aesthetically pleasing entry-level title and giving it enough time to see if it clicks with you. You really need to get into the mindset of retries and score-chasing with this genre. Don't be ashamed to play on the easiest difficulty either. Even something as basic as The Binding of Isaac can serve as a gentle introduction to the shooting mechanics, for example.