In our area a temporary sponsor is more of a bridge from outside the rooms to inside. Sort of an introductory mentor if you will.
Doing steps 1-3 doesn't have to be revealing too much on your part. It's step 4 -5 which is down the road and doesn't need to be concerning at this point.
You should never feel as if you have to reveal anything you don't want to with anyone.
If your feeling pushed explain your feelings. Tell your new friend you need time and just keep it light.
Step 1 is all you
Step 2 is you and God
Step 3 is all God
Part of recovery is being honest. Explaining openly to your sponsor is a good start!
Keep coming back !