You cannot change your name. No one want (unless you're STAFF)
Only donators may REQUEST a capitalized letter in their name, I requested the C to be uppercase and they did it for me (Used to be christmasCracker)
Since your account is fairly new, why not create a new account?
You're allowed to create a new account, and use all the same information (You cannot transfer your vouches over.)
You just cannot have the two accounts of yours, interact.