Acuba
It is quite natural to be concerned about being lost when you are a student pilot - most of us felt the same way at 22 hours!
Never be afraid or ashamed to ask for help.
Does your airfield have radar? If so, you could ask air traffic to confirm your position and give you vectors back to downwind.
I would also speak with your instructor, explain your concerns and ask him to go with you on a few right hand circuits, simulating an orbit downwind.
As your experience grows, you will find this type of occurence a minor irritation and will deal with it easily.