I have a problem with finishing all my food?

I'm not anorexic or have an eating disorder or anything, it's just whenever I'm given a meal I seldom finish what's on my plate, I'm at a restaurant and everyone will have finished before me and eaten everything but I eat so little and I get full quick.. or I just take forever to fully finish what's on my plate.

I do have a good appetite, as in I get hungry a lot but my portions are small.

How do I fix this? I want to be like everyone else and eat everything
I have a problem with finishing all my food?
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