You expect people to mistreat you. When people are friendly to you, you can easily mistake it for love and scare them away.
It makes you have a lower hand in the relationship. You may bear things in a relationship that you shouldn't stand for.
Though you may be very gifted, you may not know how to show it and make it difficult for your employers to appreciate your talents. During a meeting, people with low self-esteem will keep quiet or speak weakly. During daily conversations, they say sorry and maybe too often.