The dictionary definition for this emotional state is agitated, nervous or confused. You become this way by something that flusters you.

Is flustered a feeling?

To fluster someone is to make them feel upset or agitated. ... Use the adjective form, flustered, to describe someone when they're feeling this way. Most of us get flustered once in a while, but if you're “easily flustered,” it happens to you quite often.

What does feeling flustered mean?

adjective. in a state of agitated or nervous confusion: In the past, I have prepared to take exams feeling flustered and anxious, but now I am more confident in my abilities.