I felt the same when I wanted to pick my domain name: you're tempted to go for the traditional way of going with YourName, and then buy the .com or .org but what if you buy only one of them ? How does someone else know that YourName.io isn't your website if you don't buy it ?

My conclusion was that your domain name must not be in the form of YourName.tld; the tld must be part of your name. You can either use puns like buying yourna.me, but it's a bit weird for non-tech people, or you have to use the weirdness of tlds and go for something like lostin.space. There is less confusion at "what comes after" because there is only one.