I say, then, by the grace that is given to me, to each one who is among you, not to have a higher opinion of himself than he should have, but to think of himself with sanity, according to the measure of faith that God distributed to each one. Romans 12: 3
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People who generally have psychological problems, especially self-rejection or low self-esteem, are people who believe they are very inferior to others. This type of problem generates a social rejection, because the person who suffers an inferiority complex thinks that nobody takes them into account because they are not useful instruments for them.
The word of God teaches us that we must have a good concept of ourselves, what God does not accept is that you have a superiority complex and want to see other people as if they do not have an important meaning for you.
When the person is humble, he accepts himself as he is and also accepts others as they are. If we look at others as if they are inferior to us, we can fall into the field of pride and arrogance.
Treating people equally puts us in the right place of justice and allows us to relate to them with all humility and excellent human relationships.
Don't look down on people as if you are the only important person in life. God will hold you accountable if you treat people as if they were few things in front of you. Practice humility and think that others deserve the same treatment that you demand of them.