Negative Self Talk
A little self-criticism is a good thing because it can be your reality check that spurs you to become a better person.
However, when you constantly say negative statements against yourself, it can turn into a core belief.
Remember that the more we practice talking negatively or positively about ourselves the better we become at it, so it is our choice which one we decide to practice more of.
With time, your behavior will also change to match your lack of self belief, resulting in a person with little or no self-confidence and self-esteem.
Is that how you want live your life?
I don’t think so.