know username to my thesims3 but don't know my email

[angelme12345]

i know my username to mysims3 account but im unaware of the email as i stuidply have so many. When i log on to the email address i think it belongs to its logs me in ut redirects me to registar my account but the serila number i have already has been used on the known username. im so confused and feel like crying help!