Time Travel Possible?

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I've come to my own conclusion that time travel is impossible, unless there is a way to control everything and EVERYONE in existence phsyically/mentally. (For example, once something has happened, the past has been left behind, and the physical entities that have lived out a scenario only exist in one time, and that is ours...).

Although there are infinite possibilities and scenarios that can occur, I believe there is only one 'physical version' of existence that exists which can actually 'live out' these scenarios, and unless you can cotnrol everything in our time to actually do the reverse of everything that has occured, time travel simply isn't possible. Even then it would be implausible, as you have to consider processes such as ageing, fuels that have been burnt, the expanding universe etc... To permit time travel, you would need to have control of existence and all of the above, and us mere mortal simply do not have that power.