I think its okay to be upset and maybe you'll try harder next year. I grew up with my parents thinking anything under a 4.0 was just unacceptable! They're not slave drivers but they did think highly of their daughters and expected them to make the most of school. My sister and I did work hard to live up to expectations and I am grateful to my parents.

They did understand though that no one is perfect and didn't get bent out of shape over a bad grade here and there on tests.