PCA - What do you think? Increasing to frequency to once a week would probably help and maybe even twice. But don't forget that for every lesson you should also be self-briefing (an hour or two the day before) and you must budget for time as well as the cost. Do the money sums and see what you can afford.
And then as for self criticism, don't bother! You are not the instructor. If they say you are a plonker, then so be it, but generally when you first start circuits your flying turns to rat****. I'm a member of that club. I last did some in January and flew as a far as I was concerned, flew like a plonker but as far as the instructor was concerned, adequate.
PM