Kind of sounds like joke Gods playing doesn't it..,
Like your career is going to....drum roll please, "not"
You don't get a career!But I'm sure it's not that way. Perhaps it's saying if you are to go for the most obvious career that your MC points to, it's not the right thing for you to do?
Maybe your a bit pessimistic about your abilities to do well at work or in your career fields? Do you doubt yourself much regarding that?
Maybe you would be a good life counselor telling people what not to do? How to not repeat mistakes?
Kind of sounds like your coming from a "glass half empty" place, but someone ppl need tough love and a kind of parental structure of having someone tell them what not do, more than tell them what to do. They need very specific directions regarding what's the right course of action. Like telling your child "be responsible when driving" versus telling them "do not drink and drive, do not drive to fast, do not forget your seatbelt, do not drive to close to others, do not text and drive...etc, etc
Having, "not" right there kind of makes me think you'd be someone who comes in does clean up work and then works to maintain and make sure the same mistakes are not repeated. They know what not to do to keep everything going in an organized way.
We teach our children by saying, no...don't do that or that's not how you do it, instead of looking for the positives and praising the life out of them we look for the negatives and say, that's not the correct way.
I'm just throwing something out there because this particular asteroid very vague to me, if it landed on someone's name or a karmic conjunction you share in synastry or on a composite AC or Sun, I might give extra special attention to the relationship to make sure it was the right one. But other than that I wouldn't know exactly how to interpret it...maybe someone else will come along with a better explanation.
What sign is it in and what kinds of aspects does it make, does it aspect your 10th house ruler?