Can't Login

When I was younger (10 years) then my account (student acc) was under my father's control and through his parent account I could see my username, email and password. But now when I am 16 and want to learn calculas and wanted to access my previous account, I could'nt find, nor my father the password or the email which was linked to my account. I don't know why this happened. Now I only know my username and don't know either my password or email. I and my father think that this must have happen as I am 16 and might have crossed the age at which a child is supervised by his/her parents and my account might have been independent. Now even my father can't change anything related to my account. I am reporting this problem from a new account. I want to recover my previous account as I have earned 100's of badges and close to a million energy points and unlocked all the characters as well. Please respond to my question and give me a solution regarding this.