What's wrong with my body?

I have a height of 5.1feet and a weight of 103.6 pounds. That is, 156.5cm and 47kg. I feel the same when I was 45kg until now. Now my problem is, I gained weight yet I don't grow taller. I can't feel any fat all over my body and it's hard to pinch myself. What does that mean? Am I getting fatter or what?
What's wrong with my body?
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