I resonated with this, because I have a similar problem with bluntness - though a psychologist told me (at the age of 27 or 28) that it was due to ADD. Like, I just couldn't pay enough attention to figure out social norms I guess. And weirdly many of my friends value that bluntness - though generally when it's not directed at them. And I tend to value it too, but then I went through a long phase where I realized how I'd hurt people sometimes with it, and now over-think things and that's bad too.

It's good that you are who you are :) We need diversity in society, and being too blunt is better than not saying your mind at all!