A question need not be a doubt. The maximum questions are asked by children. It's asked out of their innocence. There is no doubt. Questioning is not doubting.
We need to be relaxed when people ask us questions. There is no need to hide, get defensive. There is no need to feel that the other person is doubting you. He simply wants to know you better. Questioning is not doubting.
Some questions are asked to clear some doubt. If you wish to clear doubt, answer the question, not dodge it. Be straight forward.
Most questions are asked due to inquisitiveness. There is no need to feel threatened. When you answer questions point blank, you win trust. Your ability to answer questions in a transparent manner makes you trust worthy. Questioning is not doubting.