Do the numbers really matter?

A year and a half ago I had pft and I wasn't confident the results were right, because the technician and her directions were really confusing, like take a deep breath now!. I just did. uh.
My pulmonologist asked if I'd do it again, I said yes
I had it redone today at a different hospital
Not that much different but all numbers are up a little bit. I still felt like the direction was maybe not the best.
I've been educating myself about lung health which is big time about exercise. I don't care what those numbers say. I know I'm much better than I was two years ago when I was smoking.
Oh. I sleighed the six minute walk test. The technician who walked with me was huffing and I was fine.