Running is definitely not easy on the knees. If you want to do it, though, there are some ways to make it a little easier. First, never ever run on concrete. Asphalt is a little better, so run in the street in a bike lane if there is one, not on the sidewalk. Best would be dirt or a track...they absorb more of the impact from your foot landing, resulting in less pressure on the knee.
Do you do any strength training? One of the best things I ever did for my knee was starting serious strength training on my lower body. The quads, especially, help with knee stability, as do some smaller muscles. Lots of squats and lunges have made my knee a lot more stable, and able to take more pressure/bouncing/strain.
Also, do you have access to an elliptical trainer or other cardio equipment? If you do, one of the greatest things I did for my knee was start on the elliptical. It is no-impact exercise, which is great if your knee is unstable, but you get a similar feel to running. It also has made it easier for me to actually run now, probably by building up more leg muscle and stability.
I feel your pain! I REALLY wanted to be a runner, but was born with a slight defect wherein an extra ligament was running directly under my kneecap, which basically wore away all of the cartilege in my knees by the time I was 16, making them very unstable and prone to dislocating. It takes diligent effort, and a lot of patience, to be able to run without pain. Now, though, I can run as often every other day with no problems (though I still prefer the elliptical on most days).
Best of luck! PM me if you have more questions!
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