Timetravel Activist,
If you believe in the multi-universe interpretation of quantum mechanics than everything with a non-zero possibility plays out. Therefore, I do not see how one could say that your future or history is being changed since one possibility, if time travel is possible, is for your future to be changed. Of course in an alternate universe, you would still be whatever it is that you thing has been changed about you.
If time travel ever becomes more than just theory, it would mark the greatest scientific moment in all history. Surely, you must agree with that.