Why can't I become in excellent shape when I work out and eat right?

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I run two miles three days of the week, and im generally active besides the running. I eat an all vegan diet. Despite this I can't seem to get passed just having an average body. Im not really fat but not really in great shape either. Im not really sure of gym techniques though. Im 6'3 about 195 IBS but i really want to take my fitness to the next level?
Why can't I become in excellent shape when I work out and eat right?
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