Why Time Travel Should Never Be Created

If there was such thing as the “time machine” then wouldn’t it be impossible to time travel into the future? In order for that to happen, it would prove that we, you, and I all have lives in each deminsion (basically every year that we live would be a diffrent deminsion).

So then if we were to have diffrent deminsions, then how do we know we are really ourselves? Every other “us” in all the diffrent deminsions would think the same, wouldn’t they?
Basically, what I’m saying/typing is that:

If we think we are ourselves, but there are other deminsions with our other selves in them. Then are we really who we think we are, -or- are we something of a figmant of someone’s imagination?


Although, that's just my opinion