"A person who is INSECURE lacks confidence in their own value, and one or more of their capabilities, lacks trust in themselves or others, or has fears that a present positive state is temporary, and will let them down and cause them loss or distress by "going wrong" in the future. This is a common trait, which only differs in degree between people.
Insecurity may help to cause shyness, paranoia and social withdrawal, or alternatively it may encourage compensatory behaviors such as arrogance, aggression, or bullying, in some cases
Insecurity has many effects in a person's life. There are several levels of it. It nearly always causes some degree of isolation as a typically insecure person withdraws from people to some extent. The greater the insecurity, the higher the degree of isolation becomes. Insecurity is often rooted in a person's childhood years. Like offense and bitterness, it grows in layered fashion, often becoming an immobilizing force that sets a limiting factor in the person's life. Insecurity robs by degrees; the degree to which it is entrenched equals the degree of power it has in the person's life."
