Sounds like you have over 16 characters, I get the hunch that your in-game username is "Lightningwolf1221" which is 17 characters long. Unfortunately with that one extra character in your username, your account will not work when you try to login in-game.
All we can suggest is creating a new e-mail on gmail, yahoo or even outlook. Which ever you wish to use. If you're worried about being unsafe, try making your e-mail the name of your username.
Regarding:
Not to be rude, it seems like your team hasn't really been updating the game for a while. The updates on the side of the main screen of the game say that the last update was like years ago.
Unfortunately the game creator left without reason, and he has the source code, meaning we cannot make any updates or bug fixes, especially with usernames. As of current, we always recommend our users to read our new Registration thread which has been made specifically for people who wish to join and for those who have any concerns about our registration. That thread can be found here (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=50461.0).
We, as staff, try our very best to keep the game running and going smoothly, and to keep members happy by creating fun events and giving our time to fix their problems and issues. This is an ever so slightly broken game and very unfinished as you can tell, though people enjoy playing it nevertheless.
I hope you understand now why we cannot make these specific fixes and I wish you luck on creating that new account.