Many of us did it when we were younger, because it was "cool" to have a controversial username, like "MetalHead69", or maybe "HipHop4EVA". These things might start to feel a bit less appropriate, when you get older.
But have no fear, because according to Google, you can now change your Google Account username in a few simple steps.
Google Account username means the part before "@gmail.com". The ability to change your username is available now for all Google Account users... in the U.S.. Google even included a video about how it's done. You may click the link provided above to see for yourself.
We assume that this option becomes available to Europeans as well, eventually.