In dilemma: Sprint or Long distance???

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I love running. I've been an athlete since I was in primary school. Actually I am a short distance runner especially in 100m and 200m event. When I was in high school I also ran for long distance event, sprinting event is a compulsory and that was seven years ago. However nowadays, my power and my speed in 100m sprinting have become weaker and slower because it has been destroyed by the long distance run..huhu. Many runners said that there is a difference between long distance runner and short distance runner. They said that the heart of short distance runner is different from the long distance runner. Is that all true? Is there anybody or an athlete in this world has succeed in both event?