flustered

To be flustered is to lose your cool. When you're flustered, you're embarrassed, agitated, or just confused.

If your pants fell down in the middle of class while you were giving a presentation, you'd probably be flustered: highly embarrassed, out of breath, and a little freaked out. It's hard to concentrate when you're flustered — it's a distracting state of mind. Being flustered isn't quite as bad as being panicked, but it's close. People can also get flustered by good things, like if someone you had a crush on kissed you.