According to your post history, your account is just waking up after about five years of inactivity. It is possible to have your name changed on this forum, but the chances are minimal, especially if you are inactive. I suppose you have missed a lot of the forum because you have been gone for so long. I recommend that you simply scrub this account and start a new one with the username you choose, then continue from there.
The account has no merit and just only 25 posts are yet listed with the account, leaving the account and create new one is better. But if he start to be active and posting in a good way, thrymos will later change the username for him. But I do not think if OP will be serious enough to make it work that way, so he can easily achieve that with what you suggested.