Look past your own injuries to the greater battle. A soldier may lose a leg, but if he quits, his loss could be for nothing. We can't always move, we can't always help. Sometimes the best way to help is to not ask for it.
Look at your own situation, then take a good, long look past it. One of the most important decisions is whether to ask for help. Sometimes it's better to ask sooner rather than to make more work for friends later. But, if you can suck it up long enough to help someone else, do so.