i don't feel like myself anymore/something feels off in the world

everything just feels fake. the people in my life, the house i live in. every interaction i have, even online. even this. it's like it's not actually happening to me, but to a random person. the last few years of my life feel like a blur. i remember maybe 5-10 events that happened during that time. it's my body, but everything else feels like a glitch or a weird dream

i know it probably sounds crazy but the more i think about it, the more i start to believe that timeline shifts/or a stimulation theory are real. a lot of things just didn't happen in 'my' timeline. certain people are still alive in it. does anyone feel the same way/has also experienced this?