Is there any way to find what email I used to create my MC account?

[Michalski]

Mojang support tells me I need the transaction ID before they can answer any questions, but I don't have it since it's on the email that I don't know.

[Nero]

I say, who cares?

Get another account or borrow a friends.

If you feel lucky, go hack someone.

Don't like any of the suggestions? Get a cracked launcher.

Cracked still has some servers.  Just not all.

Deal with it.

[Michalski]

This is an account with a glitched username (spaces) that makes it immune to commands. Without an external program, you could not ban the account for cheating.