Am I overweight?

I am 5'1" and I weigh 63 kgs.. According to the bmi chart I must be weighing around 54 kgs.. I went to the gym and told the instructor that I want to lose 8 kgs, he said that's a lot.. By looking at you, you should not lose more than 3-4 kgs.. What should I do now? I am confused.. How much should I lose?

Am I overweight?
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