Frustrated

I got a C- in my Liberal Studies 302a class. A C- is not a passing grade. I have to take this stupid class over again and it might ruin my plan to graduate in 3 semesters. It's not like I got a D or an F. I got a C-! Frick! It especially frustrating because it ruined my schedule that I was stoked about for next semester. I had classes only on Monday and Wednesday. There are only 2 available sections of 302A available and the one on Monday and Wednesday is at 1pm when I already have a class scheduled. It's not a humongous deal if I graduate in 4.5 years instead of 4 but this C- deal frustrates me.