A tip I have for you.
Whenever I go to job interviews or other such sites of emotional pressure, I prepare myself way in advance for the event. In my mind, I treat the interview as a meeting. Think about it, a meeting is something that's done fairly informally, whereas if you emphasise the word 'interview' repeatedly in your mind, it acts as a concrete signifier; one that has all sorts of nervous affiliations. Strip away the word 'interview' et voila, the pressure eases off. It worked a treat for my Architecture degree interview.
Also, embarrassment is a flawed concept. Take no notice of it.