As someone who has years of therapy experience for things I shouldn’t talk unsolicited about: therapists absolutely help most of the time. But one big problem is pathologizing things.

A lot of people fit the criteria for mental disorders in their adolescence. Thats why certain disorders are not diagnosed until they are 18 (probably country specific as well).

That is why, while you are correct that it’s a possibility, it is not the only one and depends on many factors we as non professionals can not see.