Swimming Problems

So, I swim heeeaps it's my favourite sport and I train around 5 times a week. It's great and all, but I have to wax often and I have lots of pimples and red dots around my bikini area which, I have to say, isn't very attractive D:. A lot of the girls I train with are much slimmer and haven't hit puberty yet which is a bit unfair :(

Does anyone have any tips for waxing on sensitive skin???? Thank youuuuuu xx