While other scientists are working on inventing time travel, you’ve dedicated your life to traveling outside of time. The reason? Your calculations point out that that’s where God resides.
You can’t remember when or how you obtained immortality. You’ve learned to constantly assume new identities, travel the world and remain as inconspicuous as you could over the millenia. You stopped making friends as you grew tired of getting attached to people only to see them age and die. It’s the year 3000, time travel has finally been invented, but the first journey back into the past severely alters the timeline. Somehow, you’re the only one who hasn’t been affected by this.