Is it safe to tell even close friend that you are a narcissist?

Several years ago I was diagnosed as having narcissistic personality disorder. I know how people feel about narcissists (and justifiably so). All my friends have put me at arms length and for good reason. I have a new friend who I’m very close to. She’s been very kind and sweet to me. From time to time she’s told me I wear her out and that frightens me. I haven’t been awful to her partly because she exudes authority and I respond to that, but recently I’ve been getting nasty. I’ve been taking it out on other people so I don’t subject her to it. When I sense that I’m not the most important person I have to seclude myself so I don’t get mean. I’m always thinking about the people around me (including her) and who matters and who doesn’t and who I need to be nice to and who better remember their place around me. I know most people think that being NPD means all kinds of awful things, but I’m writing because I just want ONE friend who doesn’t hate me. I see a therapist but they’re frankly out of their league with me so I’m working on my own. You can tell me I’m a bad person, but I know that already. What I need to know is if there’s a way to use these awful traits for good, and if I should tell her. I really don’t want to give her up.