That is dangerously close to woo, but is a good example on the lack of rigor in the field.
Of course, any true believer disagreeing with me will can now just point towards me being in denial.
Nobody knows the entire story of what you're going through better than you. People around you know bits and pieces. They do not have the time and energy to devote to your problems, they are making quick and dirty judgments. The often suggest something you've already tried. Or a solution they think solved a problem of theirs that superficially resembles yours. Or just what the current culture generally accepts.
And since we're talking psychology here I'm gonna go ahead and be keyboard Freud: saying that everybody knows better than you is just your low self esteem talking. I would have had a miserable life if I went with what people around me thought I should do.