Wrong: I feel amazed.

Right: I am amazed.

Amazement is not an emotion. It is a MENTAL STATE.

Wrong: I feel  indifferent.

Right: I am indiferent.

Indifference is not an emotion. It is an ATTITUDE.

Right: I feel nothing.

Correct, bearing in mind that apathy is essentially a PSYCHOLOGICAL CONDITION bordering on neurosis.

Especially if you are a writer, know your emotions, their terms, their descriptions, and their references. Do not mix apples with oranges. Otherwise your readers will be walking around with your ignorance in their pockets.