It’s often hard to know if you need you need help, it’s why we go to a doctor for a checkup - it’s equally important to focus on your mental health as your physical health.
And routine checks on basic indicators like blood pressure and cholesterol are part of conventional health advice, particularly as people age, in order to identify and respond to problems early, before they become much more severe and difficult to treat.
Equivalent preemptive/preventative treatment for mental health is less understood/available.