Iv gained loads of muscle but my weight is the same yet I can't loose or gain weight when I try?

GamerTomboi16
Iv been the same weight for about 8 years which is 6stone but I cannot gain or loose weight even if I tried! I gain muscle very quickly and easily and now my muscles are quiet big and noticeable but my weight is still the same, im also quiet short for my age and my family keeps nagging me to gain weight when I simply cannot and its been driving me nuts! Why can't I gain or loose weight but I gain muscle easily but how does it not effect my weight? Any ideas please!!
Iv gained loads of muscle but my weight is the same yet I can't loose or gain weight when I try?
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