It's all in my head?

"The brain f%cks with you. You aren’t sure if the pain and fear is in your head or if it is real. You aren't sure if you need to toughen up or pull back. You question if you’ll ever, truly be back in the game with full self-assurance and gusto. You wonder if you are destined for a life of slow running, very low weekly mileages and too much cross training to bear. "  --ShutUpAndRun

Thank you  SUAR. That's just how I feel. I usually err on the side of caution (& wimpiness). I'm paranoid of redeveloping stress fractures or developing new ones. So I end up not training hard enough.