The jumps aren't the problem, usually. It's the landings, especially the bad ones

I've gotten injured "landing" on safety mats, soft grass, pavement, rock, stairs, bla bla bla.
I have not gotten injured playing "FarmVille", but did get bored and fat.
Frosty's right and wrong. You ARE compared with everyone else. At the same time, it's a lot about personal progression. The hardest thing I've found has been the frustration of "I used to be able to do X, but now I can only do Y." Whether X is something I could do as a 20 year old, or something I could do before my latest injury, the frustration is still the same for me.
"Pick yourself up, dust yourself off, start all over again..."