agree with post above, you seem to be fitter than whomever the plan is aimed at. Try timing youself over a fastish 5k and then try somthing like the mcmillan calculator to predict your 10k time and get appropriate training paces.
Rachel, first ask yourself why do I want to join a club? Then narrow down to the ones that look like they will address that need and just go along and see if they fit. For some it's social for others it's structured training, similar ability groups etc.