Silver, don't be depressed ! (altho there I was joking about being depressed about VB's miles, so do as I say, not as I do, LOL
)
The reason why I track my miles is to gauge my own improvement over the years. It's really gratifying to look back at my journal and see how much stronger and faster I've gotten over the past few years, and to see how routes that were very challenging for me a year or two ago are less so now.
There will always be someone who has ridden more miles, climbed more hills, and done it faster. People like that are great motivators, it's fun to see how much individuals can achieve (and wonder "how the heck they can do that?") but don't let others' achievements detract from your own.
Look at how far you've come, after your injury and all, that's the important thing. 
yeeks, I'm being entirely too preachy here.
2009 Lynskey R230 Houseblend - Brooks Team Pro
2007 Rivendell Bleriot - Rivet Pearl