Why do we believe the worst things about us?

This gives me the tots;really why do we believe the worst things about us?
I begin like this do you know those so called critics are not sincere?
Why do we think the advice is real?Thou am wondering does not make me certain but i think to some extent i have done my own survey and i think the critics is just a way human beings run their mouths, believe me they run u down but they want to be like you.
This is serious thou but no strings attached at the same time,is just the way i ve bn feeling a while.Oh yes!u can correct me if am wrong.Okay!Okay!Dnt want to sound pathetic now letz hit the main question .
Why do we believe the worst things abouts us?
To me i think those that believe this they are not in touch with their confident side i think o! not so certain,remember u can correct me if am wrong,then maybe because they believe in the peopple so much.
I take my stands here by a little review do we ever ask these questions?
Why dnt we get praises about the best side of us?
Yeah that is it! We are getting there,because codemning the best part brings the worst things about us.