Do not compare yourself to others, or to what others do.
I admit that it is impossible not to notice others but, like golf, your important comparison is to what your performance and condition were a month or two ago. I know - you start with one chin-up while some 60 year-old lady is doing 10 or 12. Admire what she does if you must, but aim for 1 1/2 or two for next month.
As I mentioned, Mrs BD and I are in "training" for an 7-day hiking trip, 12 miles/day (with a side visit to Edinburgh). It's remarkable to me how endurance can advance by training for it. For serious hikers, our challenge is no big deal even with 50 lb. packs. Not me - I am fine with 12 miles once, but I don't know about daily.
Addendum: I heard on the radio this morning that Edinburgh is the #1 tourist destination in the Western world this year. I've been there. I don't really see the attraction... the appeal of Scotland is the grey dreariness as a contrast to the warm and sunny summers in the US.