I've lost my account

The links the other Ambassadors provided unfortunately lead you to Portuguese and Canadian websites in English.

If you want a localized French instruction on ways how you might find your Microsoft Account email again, go to Forgot the
Microsoft Account Email Address for your Xbox Live account? Learn How to Find It.

That page will show you several ways on how you might find your account email again.

If that doesn't work, be aware that Microsoft might also delete your account, if it's inactive for more than 5 years. So if you are sure of the email you're trying to use, and it's not found, you might have not used the account in the past 5 years, and it
has been deleted.

Please check https://support.microsoft.com/en-us/help/4511051/microsoft-account-activity-policy about the Microsoft Account
Activity Policy if and when an account might (not) be removed from the service due to inactivity.

Hi There,

If you've forgotten your email, see if you can find it again using this troubleshooter.

Link: https://support.xbox.com/en-CA/my-account/microsoft-account/forgot-microsoft-account-solution

Then once you have your email again you can return to this one to continue recovering your account.

Link: https://support.xbox.com/en-CA/my-account/microsoft-account/lost-password-solution

Thank you for your answer but I can't remember my email so..

See if this link can help you, good luck!

https://support.xbox.com/pt-BR/my-account/microsoft-account/lost-password-solution

Si tu a plus ton email tu ne pourra pas le récuperer la meilleur option reste de contacter le support au telephone directement