I'm a 25-year-old guy and I've been having this breathing issue for about two weeks now. It really feels like the air isn't reaching my lungs properly, so I'm finding myself having to take really deep breaths or breathe through my mouth more often. I went to see a doctor and they did a respiration test that turned out fine, but I'm still experiencing the problem. I'm a bit worried and could use some guidance or advice. Any insights would be really appreciated.