You can’t, man. :(
I mean, even with stuff you do leave behind (see above), how long does it have to last to be a lasting trace? A...
I sing often and terribly. There are a lot of things one will do as a teenager that one would be petrified to do as an adult.
The last thing I sang live for an audience was “It’s Tricky” by RUN DMC with a friend. That’s… that’s about how awkward that was.