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I had a hard time getting a guitar to sit comfortably and went through a few different seats (and guitars) in the course of trying to work it out. The couch is too low. The stool is too high. I felt like Goldilocks trying to find the one that was just right, and then I got a simple folding chair with a flat seat and straight back, and boom — I could finally find some agreement with the guitar on how we ought to sit.
Some people prefer to stand and play with the guitar strapped on, and I tried that, but some shoulder issues cause my fingers to go numb pretty quickly that way, so unfortunately that one’s out for me. It might be good for you, though. Basically, just keep trying different things until it clicks into place for you.