I don't know how long you have been here and how long you have been meditating but give yourself time.
Usually making you believe that you are Yehuborim is the first psychic attack of the enemy so I am not even surprised.Do RtRf more often.
Plus, I don't know how long you have been meditating but I don't think the fact that you are not advancing means that you are Yehuborim, I think you simply need to do more work on that particular meditation.
I think you should take it quiet. Keep meditating and doing RtR and slowly this thought will fade away by itself