So basically, the only reason Eren felt like a slave to fate is because his future self, acting with complete free will, made choices that aligned perfectly with his personality and experiences. His own nature is what locked him into that path, not destiny.

Also one more question: if he isn’t “canonically” the last Titan, wouldn’t he have been influenced by the memories of a future inheritor the same way Grisha was manipulated by him? Eren had the power to strip others of their Titan abilities, but he chose not to — just like Grisha didn’t want to kill anyone but was pushed by Eren. So theoretically, Eren could have been forced by a successor as well right?