Yes, you can be an athlete who is a walking ball of muscle with low body fat and have a off the scale BMI... But are you?
People love to cite examples of athletes and uncommon exceptions to rationalise to themselves that BMI is meaningless to them.
It is not. BMI is a perfectly suitable indicator for the general population.
You are not the exception and neither is 99% of the population, if your BMI says you obese then you very likely are. Take it as a wake up call and an opportunity to ensure you retain your medical for as long as possible. If your BMI is 38+ now then the clock is already ticking for losing it for a more serious reason in the very near future.. Ones that can't be solved by throwing out the hidden bickies.