How credible is psychology?

It's a hearsay science made by people that is highly controversial.
But at the same time it's based around some elaborate tests that make sure it's not pure witchcraft.

But according to true psychology, many things that are socially acceptable and even encouraged are in fact mental illnesses yet we still don't see them as such and only resort to psychology when it aligns with what we belive.
4 mo
Ok it seems I was misunderstood. I am FOR psychology not AGAISNT it. This question is not about doubting the science behind it it's about asking why are social practices that fall under the "mental illness" category still preached and practiced by society.
How credible is psychology?
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