I'm so afraid of this person.what should I do.?

I work in the I.T. department for this company, and I'm so afraid of this finance director because he's the CEO's son, and the future CEO. I deal with him all the time, and I'm so sick of it. I get panic whenever I have to deal with this guy. What's wrong with me? I'm trying to stay away from him as much as possible.. Am I doing the right thing? What should I do?