Hi tattoo -
Welcome to SR. I'm not in AA so can only give general mentoring advice.
Do you think that you're being this person's sponsor sets them up for the best opportunity for success in sobriety, or is this a concern because being a sponsor is something that you want?
Your post mostly speaks to how you're feeling and being affected by the situation and what you want. The path forward might become clearer if you focus on the needs of the person your trying to help instead, taking into consideration the points that your sponsor raises.
I would be cautious to discount your sponsor's input given that they have
1. spent considerable time with you & have a good read on where you are at in your recovery
2. have experience being a sponsor themselves
3. their goal is to assist you in your sobriety
Part of the skill in being a good mentor is understanding how to get beyond the delivery in order to hear the core of the intension.
If becoming a sponsor is something that you would like to do, then why not work with your sponsor to come up with a development plan?