forgetting things

Why do we just forget? Like what's the point why does it exist. We should be able to remember things. We should be able to pick and choose what we want to remember. Ik this is unrealistic but Ik you just hate thinking of a good idea but you do something like sip water b4 u go and do it then now you completely forgot what your doing. Forgetting your chores then your mom beats ur ass because you didn't do your chores. Like who invented forgetting stuff because I wanna speak 2 their manager ;-;