Narcissism is marked by an inflated sense of self-involvement, self-absorption, self-importance, and self-image.
People with DPD often feel helpless, incapable of taking care of themselves or taking any decision without outside help even in small day to day activities. They may have trouble making simple decisions. With therapy a dependent personality can learn to cope up and start taking analytical and rational decisions by oneself.
People with OCD repeat behaviours over and over again. For instance, you might have to repeatedly check to make sure that the front door is locked or that the stove is turned off or even have thoughts which are reoccurring again and again.