Is it normal to think that time travel is impossible?

I think that time travel is impossible because time is just a construct that we humans use to chronolog reality. There is no past, nor is there a future, The only thing that exits now, will exist tomorrow or has ever existed, is the present. THE PRESENT KEEPS HAPPENING. No one can 'go back' to their 10th birthday because you and your friends are no longer at Chuck'e Cheese's. You all have moved on with your lives and the matter that makes up your bodies is at a different location in the universe than it was on July 23rd at 2:37pm, 1996. You can not 'go back' to you wedding day because your wife is working as a walmart cashier right at this moment and you are reading this post. That is to say... if you could hypothetically 'go back' in time to your wedding day your wife would not and could not be there because she is no longer 'there' shes standing at a walmart cash register. You can not 'go to' the future where she will be standing in the unemployment line because she lost her job for stealing from the cash register at walmart because she has yet to commit the crime. However, reality will continue to happen, as it always has, and at some point her stealing from the cash register at walmart will be happening as others around the world and entire universe will be doing things other than stealing during their stay in the 4 dimensional plane called reality.