Hello. I am really scared to meet my girlfriend's mother and father because they seem like very high-class type of people. The father has a PhD in pure mathematics, a PhD in theoretical physics and a Masters in economics. He is a professor who teaches at Yale. The mother is a corporate lawyer with a PhD in law and has successful firms. I am currently in my second year of university as a chemistry major.
I am scared I might say something stupid or not be good enough for them :(. I don't know how to act and I wish I did not have to go over to their house on friday night. How should I act? I don't know what present should I get? My gf tells me not to worry but why am I getting so worked up? :(

