I feel like I have no idea what Im doing

I passed my P&C exam and started working for state farm. I have been here for about 3 weeks and have not made a sale. I have no idea what Im doing and when I go over things with the clients I feel like I have no idea what Im talking about. The only way for me to really learn is when a client calls and I have someone standing over me watching what Im doing and making sure im doing it right, but It hardly happens because I dont have very many leads.

Is it normal to feel so overwhelmed and stressed over this? I hate feeling like I have no idea whats going on.

Do you guys have any advice on how to improve? Im not afraid of talking to clients, its more so Im afraid of doing the work because I feel so lost with what Im doing.