why do people think that the female counterpart of the penis is the vagina?

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wrong, it is actually the clitoris; and the labia majora are analogous to the scrotum

Both are the places where urine water will be out.

The Clitoris is the counterpoint

no the Clitoris is the counterpoint

Fact Time

The clitoris -- which in full, internal and external, is nearly of the same size as the penis -- is usually the most sensitive spot on, and involved in the most sensitive areas of, the vulva. It's got twice the number of sensory nerve endings the penis does, and it also interacts with over 15,000 nerve endings throughout the whole pelvic area. It is created of the same sort of erectile tissue that the head of a penis has. 

https://www.scarleteen.com/article/bodies/innies_o...

Actually,  you're wrong.   The vulva is genetically similar to the scrotum and the vagina is similar to the shaft of the penis and the clitoris like the tip of the penis.

cause thats what people are telling them

Even that is an over-simplification. For example, the labia majora are homologous to the scrotum.