What's this feeling?

My body ain't all that type of buff where its like (Baki or Yujiros from the anime baki) but when I see a trans guy or any dude that has bigger arms I feel smaller and ten to over worm myself. Does that seriously mean but because I have a smaller yet fit body I feel weak towards others and is ashame or it or something? Im just woundering what this feeling is.
What's this feeling?
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