Strength???

How much is it normal to lift?
I can lift easily 6 water gallon bottles, water cases, large stacks of chairs, a couch full of people sitting on it to get to a plug in the back, heavy bags and other weights, I ask because my family was surprised I could move 2 solid wood doors. Are they that heavy?? a dishwasher to everyone is light as air but how heavy are other things, how much do you lift? I virtually have been lifting everything heavy since I was in the 8th grade cuz there were no men in the house, all my family and the ones that visited called me Hercules, maybe it's because I'm short they say that?