Dear Dr. Tracy, this is going to seem like a really dumb problem i'm sure, but i can't find any reference to it in your library. Dear Confused, There are no dumb problems but there are plenty of dumb solutions.
People react from emotions and fear instead of from thoughtful analysis.
You are about to react that way. Your inexperience makes you upset. Instead of getting upset or insecure because the girl says she's in a bad mood and doesn't want to see you, be glad she's not going to take her bad mood out on you. Be flattered that she cares about you enough that she doesn't want you to see her when she's not at her best. Call me or e-mail me when you're feeling better.