I’m recovering from a knee injury (patellofemoral articulation fissure and baker cyst). Doctor said no running for a few weeks, no leg presses, no squats and moderate bike efforts if at all. In other words just use my legs to walk.
Yesterday I had my first ride in almost 3 weeks. For the first time in a long time I was able to just enjoy the good weather, look at the scenery… No heart rate monitor, no cadence, no avg speed to worry. I even helped a lady and her young girl fix a flat tire. Usually I only stop to help cute single women 
The point is that at least yesterday I wasn’t frustrated about my injury… I was just enjoying the fact that I can still ride my bike with little pain. Being injured gave me a chance to understand that I was paying too much attention to my training and letting it become a stress in my life as opposed to being out there enjoying the sport.
I hope I can keep the good attitude because sooner or later I’m going to be frustrated about not being able to push myself to the fullest.