Might this
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I disagree with other advice about needing to be honest.
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Some may say it is not healthy to go into a situation whose success is based upon hiding who one is.
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Might this
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... part of getting along with others is to "blend in". To be able to enjoy the same things they enjoy.
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You may wish to read posts about kids who "hide", underachieve, or become frustrated and act out.
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There is a difference between the art of blending in, and the shame of hiding who one is; Hiding and blending in are two different things.

Part of getting along with others involves accepting one's self, including differences, so that one can genuinely accept others, including those things each individual may enjoy which they do not have in common. The need to hide who one is, is not conducive to a child learning to accept one's self... or others.