The charm of dinghy racing is that it is all in the skill - you can compete on equal terms with everyone and there is no reason that you can't improve. (And, as racing driver Graham Hill always used to say, you meet a better class of people at the back of the fleet...)
And finally, because points only go to participants, even if you are last in each race, if you turn up to lots you will still finish higher in the series than you think, and have a lot of fun too.