You cant evaluate even your overall results over such a small sample, and even less results from individual position. Even after 100.000 hands there is still huge variance in the results, when you split them up by position.
And as the other reply state, everyone lose from the blinds. This is obvious, because the blinds are forced bets with random hands, which is never going to be a winning strategy. Without blinds the optimal strategy in NHL would be to go all in before the flop with AA and fold everything else.
My combined loss rate from SB and BB is somewhere around 30 BB / 100, and this is the kind of number, you should be aiming to see after 50k or 100k hands. Until then dont even look at these results. Just focus on playing good solid poker, and if you do, the results will come.
That being said, if you find yourself often cold calling out of SB, you can almost certainly improve your results by simply stopping to do that. It is possible to sometimes make a profitable cold call from SB, but playing strict 3-bet or fold is much closer to the optimal strategy, than what most players tend to do, when they are new to the game.
So the answer is, you should not stop to defend your blinds, but you should probably stop almost entirely to defend your SB by calling. If its not good enough to 3-bet, just let it go. BB is very different, because you are getting a good price and closing action. Its very far from optimal to never call from BB, so playing pots out of position without initiative is something, you need to get good at, but you dont need to add in extra spots by limping into pots or cold calling from SB.
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