I can tell you from my own experience that being “ direct and honest “ will
not make you many friends. People do not want to hear the truth about anything. It makes them uncomfortable. Most people get through life wearing a “mask” of some kind as a defense mechanism. I do believe though that not everything is just black or white. There is a gray area. And that’s usually the center. Finding that grey area will likely make things a lot easier for you. But I will never give up a trait that I believe is admirable just because people don’t want to hear the truth. I guess you have to learn how to navigate through your interactions with others. Finally, I don’t believe at all that this part of your personality is any kind of “ mental instability “.