here is a post about finding the confidence interval around your winrate.
http://forumserver.twoplustwo.com/sh...amp;PHPSESSID=
Notice how the confidence interval stays very very large despite the number of hands you play.
And the frequency with which you have winning sessions can depend a whole lot on any number of things.
But you are an idiot if you think losing x BB (when x <= 150) over y hands (when y <= 10k) means ANYTHING about how well you play. There is just not enough information in that statement to determine anything.