Just because you aren't given the credit and haven't been recognised for your work doesn't mean you have to give up or stop. You don't always need credit, other people do not always have to know what you are capable of doing as long as you do.
The truth hurts. A narcissist paints a picture of themselves as being the victim or innocent in all aspects. They will be offended by the truth. But what is done in the dark will come to light. Time has a way of showing people's true colors.