[quote=@Prince of Seraphs]
<Snipped quote by PharaohAtem>

What you're talking about is a predestination paradox, an event that results in the creation of itself.

That's Big Bang Theory logic. In quantum mechanics, it's either fifth or sixth dimensional theory, altering the flow of time causes it to diverge rather than fold back upon itself.

The upshot of that if you go back in time the timeline that you originate from is maintained and becomes for all intents and purposes inaccessible to you. Any changes you make in the present will have no effect on your physical being, existence or memories. So if you go back in time and kill your father nothing will happen to you however the you of that timeline will never be born. This is the version of time travel that is best supported by actual science however it is rarely used in science fiction because if it was you can never return to your own time or place. If you tried you would be traveling to the future of the new timeline that your presence has created. It might be identical to the one you left depending on if you changed history but you would find that timeline's version of you living your life which means that from a story perspective unless one of yourself dies there is no way to write a happy ending and even if one of yourself dies it still kind of melancholy.

The logic that by time traveling you would accomplish an action and because that action was accomplished you have no motivation to go back in time in order to accomplish it is both cyclical reasoning and if it were true prevents time travel from being physically possible because whatever action you did after time traveling would be instantly undone by your future lack of motivation to do it.
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Your almost right but not quite you can't directly manipulate your own past like you said you would lose the motivation once you did so nothing would change but if you created someone or something like in this case a child in the past with the intention of altering it for you once you meet that child you then have motivation to go back and recreate that child so the changes stick.