I feel like I want to kill myself. Help me!!!!?

I graduated from college last year with a Bachelors degree in Psychology. I went to Hunter in New York. My GPA was a 2.5 overall and 3.0 in my major. I was always horrible at taking tests. I'm currently working as a researcher at a neuroscience lab. I applied to four Masters programs in experimental psychology and cognition. I just found out that I got rejected from all of them, due to my low GPA! I have excellent critical thinking, research, and writing skills. I believe that I could do much better in graduate school than in undergrad. I am so depressed about being rejected. I don't know how to deal with the fact that grad school is not for me. Should I kill myself?