Concerned

I am beginning to wonder if I can do this thing. I did 5 miles on the treadmill today and my legs and feet are still hurting. I am guessing it's part age and part shoes. I took the met pads out, they just weren't feeling right, and I still had some burning but not as bad as without the new insoles. My shins are hurting in different places now. Oh brother. I don't remember feeling like this 10 years ago when I trained for the Portland Marathon. But I was just a sweet young 34 back then! Something's gotta give.