Knowing what you want

Prayers got to specific, you got to know what you want.
However, one common problem i face, is that im not sure of what i want.

Sometimes i think, we do not recieve what we pray forbecause we are not sure of what we want and are just praying for it anyway. And i suppose God knows, and as a result withholds, for he knows that you do not really want what you are praying for.

Just like a spoilt child who would simple demand his parent for the toys that he had his eyes on and cast the toy aside once the novelty disappears. God knows better than to give us something that we will not cherish and throw away in the future.