it's humbling when you realize you dont do a thing as you expected and much more if there are other persons close.
Those situations brokes our "ego" but i think its just a thing of adjust our expectations about ourselfs in that topic.
And you are not a weak ass girl it's just you dont work cutting trees and althought i dont know you weight is 40-50 kg less than those guys.
So those guys with another men who weight 50kg more than them will feel are not so strong... of course taking into account all persons works out in the same way.
So i just feel bad if i dont do all i can do in a topic knowing my limits, by example... i'm not going to be the stronger men in the world (there's always other stronger than you and more smart, and such...) i just need to be the maxium strong as i can and when i cant go gym as often as i can it makes me feel bad.
And i only measure things when i have a little idea, ability of be able to progress, of course if i go to the space as astronaut nowadays... you can guess my work there could sucks as much as you cutting trees :-)