They are depressed, timid and anxious. This is often coming from a youth as neglected child. The parents can have been absent, having no time for the child or can even have been abusive and beaten. On top they get the feeling is is their own fault, that there is something wrong with them so that the parents had to behave the way they did. They often try to please their parents, but that does not seem to help.
They become very cautious in order to get some appreciation and love, mostly in vain.