I don't think you are spelling your word correctly. You could mean flattered, or flustered. We don't say "I'm fluttered".
To flatter someone means to say something very nice to them, and you might want to flatter them, even though you don't really mean the nice things you are saying. You could compliment a person, without trying to flatter them, and that would be appropriate.
If someone is flustered, they are nervous, agitated and "at their wit's end". They may be hungry or tired, and in that situation, even a little stress could get them flustered.