This does not make me a failure, in fact, I am very proud of that swim. Thou shalt not expect thy child to become an Olympian. There are 225,000 athletes in United States Swimming. There are only 52 spots available for the Olympic Team every four years. Your child's odds of becoming an Olympian are 1 in about 4,300.
Swimming is much more than just Olympics.
Ask your coach why he coaches. Chances are, he was not an Olympian, but still got enough out of swimming that he wants to pass that love for the sport on to others. Most Olympians will tell you that these intangibles far outweigh any medal they may have won. Swimming builds good people and you should be happy your child wants to participate.