It sounds plausible, but I think the best thing is to find a good internist who is knowledgeable and takes you seriously at any age.
Not that your statement requires any reinforcement, I would like to offer a brief story. Saw my internist starting when he was quite young and I was only 13. As the years went by he would laugh when I would go in and insinuate that everything I was saying was made up because I was "too young" to have this or that. When he retired 35+ years later I as a 50yo had to go see another physician who after a brief checkup asked,"My God! Why havent you ever sought treatment for (this), (this), and (this)?"