If the fact we were not a stick meant that we were beyond the laws of physics then you might be right...but we are not beyond the laws of physics. That my friend is basic physics and it applies no matter how much you may, or may not, like it...sorry that is scientific fact F = ma... and it is no more complicated than that.
It's a little more complicated than that. There are other factors involved:
1) The impulse (the change in acceleration over time), which is the difference between a push and a strike.
2) The type of collision (elastic or inelastic collision), which is the difference between punching a soccer ball held in your hand and punching a brick wall.
3) The applied pressure (the smaller the surface area, the greater the applied pressure for the same amount of force), which is the difference between a slap and a back fist. A knife will stick into someone because of the extreme amount of pressure applied by the tip.
4) The contact angle, which is the difference between a glancing blow and a full on hit.
5) And of course weakness of the target.
All of these factors are interrelated, for example the rigidity of the striking tool and the target determines the type collision (most collisions are a combination of elastic and inelastic collisions) and the amount of impulse imparted to the target.
It is not so much how much force you can generate but how that force is applied to the target and the selection of target that matters.