How to execute a command on everyone except me?

For a game I have been making, I want to (before I use @p) make the /execute command find everybody else except me. I tried:

/execute @a[type=!Player,name=username] /myCommand

But it doesn’t work! Can anybody help?

Note: [username] is to be replaced with the user’s Minecraft name.

/execute @a[name=!username] ~ ~ ~ /say Test