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Your metabolism is based on how efficiently your body tissues process nutrition and so your metabolism should be great. If you're asking about causality, running more can improve your metabolism, but having a high metabolism rate does not mean you will be an excellent runner. I am an endomorph and my metabolism is naturally really bad, but after a couple years of training, I've become a pretty good runner and my metabolism has improved. I have friends though who have excellent metabolism but are terrible runners. You need stamina to run, not a good metabolism.
Your speed depends on the length of each stride and the rate at which you turn strides over. If you want to go faster, you have to increase either stride length or stride turnover. The length of your stride depends on your height, your fitness level and your body's individual biomechanics. Regardless of the length of your stride, a faster stride rate of 180 to 200 steps per minute may be the best way to improve your running performance. Shorter distance races call for longer strides.