Can a sexual health counselor tell you that there is something wrong with your sexlife?

Of course. If you are seeking help from an adviser it would be beneficial to know their qualifications for the position. Even if they are fully approved, it may not be true that all of their opinions are correct. On the other hand, if you do not have a problem, why are you seeking advice? Entering into an interchange with a psychologist may force u to look at yourself in ways u are unhappy with. Listen.