The main difference between these words is that “embarrassed” is about what other people think of you, while “ashamed” is more about what you think of yourself. That’s why you can never feel embarrassed when you’re alone. … Being ashamed, however, is something personal. It’s often related to feeling guilty.
I was embarrassed giving my presentation in front of the class.
I ashamed that I started smoking again.
S.A.F. English 