This goes in the same bin as #logical and #rational in my frequently used funny-sexy-cool test. Only other people can decide if you're #funny or #sexy or #cool. Not only do you not get to make that judgement about yourself, it's a terrible mistake to try—because the more you announce to people that you are that thing, the less likely they are to see you that way. Show, don't tell.
Many desirable characteristics, including #logic and #rationality and #empathy, work the same way. I *try* to be empathetic, and as far as I can tell from the reactions of the people around me, I succeed most of the time. And I trust many of them to tell me if I'm being a self-centered jerk. But being "an #empath" isn't an inborn characteristic. It's a *behavior*—and like all good behaviors, past performance is no guarantee of future results.