What if today is actually you’re last day alive. And it is also your first day alive, in a sense. What if your mind is destroyed and reset everyday, whilst retaining every past memory at the same time. In that case your entire life has been an accumulation of various lives, lives that all believe they are one entity. In which case I will probably be dead as you read these, and currently there is a being wandering the earth who believes they were the one who wrote this.
Just a thought. I get odd ideas like this all the time.