humans focus on negative more than positive

i heard someone say that as humans our natural response is to focus on the negative more than the positive and im pretty sure thats true (don’t hold me to it), i never remember truly ever being happy, i know i’ve felt happiness before, i cant be sad all the time. but when i think of happiness or happy memories nothing comes up. like it never happened, like all my life i’ve been miserable and bringing misery upon others. it seems that my life is one big loop of pain and bringing pain to others.