All those go-arounds add to the experience. As a recently qualified PPL I fully understand your frustrations. One thing I did was to suggest to my instructor that we go off and do some general handling - steep turns , introduction to stalls etc and then come back to the airfield for a circuit or two. Remember, as others have said, it is not a race and any time in the air is useful, even if you do not think you have learned anything from that particular lesson. Subconciously you have. Took me nearly eighty hours toget to my skills test but did I care? Not one bit. I enjoyed the experience as much as I do now that I have my licence. Happy landings.