I run marathons and train thousands of miles in all weather. It seems I am not weak. Yet I look at myself, the things I have endured, and I see weakness. I have never starved. I have never been lethally chased, barring an incident in 2004 with a boulder. My life is and always has been easy compared to billions of others. I can't imagine any self inflicted pain equivalent to the difficultly the poor, starving, chronically sick go through every day.
In short, no matter what pain and suffering I endure it will never be enough for me to consider myself strong. I mean, I am strong, but in the pursuit of more strength there is always weakness.