TIL the old guy at the yarn shop was right about my tension and I hate admitting it
I've been knitting for 4 years and always ignored the whole "check your gauge" advice because I figured my hands knew what they were doing, but the owner of String Theory Yarn in Portland looked at my half-finished sweater last Saturday and said "your left hand is choking the yarn, that's why your rows bulge." I tried holding the working yarn looser like she showed me and my gauge swatch went from 22 stitches to 17 stitches per 4 inches, which is a huge jump and now my sweater would actually fit a human. Has anyone else had a shop owner point out something about your grip or posture that you'd been doing wrong for ages?
The lady at my local shop caught me throwing the yarn with my whole arm instead of just my wrist and it was night and day once I fixed it. What helped me most was slowing way down for a couple weeks and really watching how the yarn feeds off my finger. It feels weird at first but your hands do adjust, and the fit is worth it.