I saw a physical therapist yesterday and he said that it looks like I have some scapular dyskinesis, which I guess essentially means that my left scapula/shoulder blade isn't moving as it should, or at least as good as it should, and that it's slightly flared. To fix it he gave me a couple exercises to do and Raf has me doing a stretching/mobility routine as well. Hopefully this problem can be fixed or at least mostly fixed in the coming months. It has been interfering with some of my exercises and causing me a lot of mental doubts. But it's nice to have a better idea of what the problem is and be on the path to fixing it.