How do I deal with people taking advantage of naivete because I have a very childlike, little girl personality?

How do I deal with people taking advantage of naivete because I have a very childlike, little girl personality? I admit to myself I am actually like a little girl. But I am nice and sweet. I try not to hurt others feelings. I am playful at times like a little girl is. B most times i am shy and quiet and just a innocent type.
How do I deal with people taking advantage of naivete because I have a very childlike, little girl personality?
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