Uncertainty

I feel so inadequate and confused. I don't know what God wants me to do with my life. I feel so unqualified and scared to death to be a social worker. I feel that i am not strong enough to do that type of work. I have a job interview on Friday at a mental health facility in which I will be working in an inpatient facility with troubled kids and teens. I don't know if I am ready for this. I am really scared. I am afraid that I am going to fail. I don't know if I can do it. I don't know if I can be a social worker. What would I do if I didn't do that. I don't have a clue. I am afraid to take risks. I don't want to do something that I will not succeed in. I don't want to fail these kids. Am I strong enough? Do I have what it takes to do this job and to make a difference in the lives of these kids. Will I blow it. Is this what God's wants me to do. I don't know.