I have read so many forums on this and I still do not understand and it's affecting my ability to move forward with learning physics right now.
Imagine the following scenario: a person on a frictionless surface pushes on a stationary object. Both the person and the object have the same mass. I understand that if the person pushes with 100N both the person and the object will feel that force (though in opposite directions) due to Newton's third law (though I'm not sure WHY the reaction occurs, but that is a question for another day).
Now imagine the same scenario but instead of an object with the same mass it is another person with the same mass. Both people push off each other with 100N. I have been told that this will look the same; both people will feel 100N. However in my mind I am imagining that each person will feel the 100N push from the other person as well as the 100N reaction force from their own push. Should this not total to 200N? And if not, WHY NOT? I do not understand this and I can't stop ignoring it anymore.
Thank you for your help, I'm sorry that this is probably a really obvious concept that I'm just not grasping but I cannot wrap my mind around it at all. Thank you.