Can someone please give me advice?

I feel so lost like i don't know what i'm doing with my life. Even though i started try to become a new me by going to the gym, and taking martial arts, I find myself asking did I pick the right career? What is to become of me when i get in my 30's,wil i ever get married and have kids? In 2008 my grandmother died so we moved to FL. In 2009 we find out my father was dying, he dies in 2011. I finally go to nursing school after 7 years of trying, I graduate in dec. 2012. Take the test 2 and fail. I get one more chance to take test. So I am very nervous. But I just feel like a failure i'm 27 living at home with my mother, I never had a boyfriend, and i am still a virgin. I feel like by the age of 30 if I don't have nothing going for myself on my birthday i'm going to off myself. Because i feel no matter how hard i try i keep having an obstacle in my way either to go to school, or find a guy i like. I feel as though maybe GOD doesn't want me to do anything with my life like i'm meant to stay with my mother forever.

:(