time machines dont exist… time is a false perception to relate other physical aspects such as expansion/movement of dimensions with respect to other ones..
the nature of reality is a multiverse.. deal with it… when one "goes back in time" you are actually slipping into another universe
if time was actually linear then a paradox would of been created at some point in the future and collapsed to the past… in essence you wouldnt even realize you or the universe even existed… essentially halting its existence before if had a chance to exist
good luck shillin bitch