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Yes everything is. Somebody wins and somebody loses.
Almost nothing is. Only where a transaction requires the destruction or exclusive consumption of goods/services rather than the transfer of goods/services do we actually see a zero sum.
Most things in life are positive sum gains between two people. Both people win, or at worst, one person gains significantly more than the other person loses.
It all depends on your own personal attitude toward yourself. It can be a zero sum if that is the way you look at life, or it can be positive or even negative . . . It is all up to you and your personal attitude.
Personally, I always look for the positive that always exists in everything. Therefore my life has always been a positive sum experience.