As the famous saying goes "No Pain, No Gain." I never thought you were the weakest member in your team. Anyways, scientifically speaking, pain is a physiological response of your body to discomfort. If you are able to endure it and translate it into physical progress(commonly by bodybuilders) then it is really something positive. As long as the type of pain is non-lethal, then it is really best to experience it once in a while.

There is also a saying that "It is the same boiling water that hardens a potato that also softens the egg." It is not the circumstance (e.g. pain), it is what you are made of. Pain is inevitable but also useful. :)