It's also mental.

You have to push through. You have to keep going. If you can't get past the difficulties one way, then you have to try another way.

This video by Brian Duff, the author of the excellent book Mind 4 Survival: How to Face Any Crisis, Minimize Unwanted Struggle, and Live Your Best Possible Life (which I strongly recommend here in my review), really resonated with me, and I think you'll enjoy it too.