Managing personal Outlook.com account settings, security, and privacy
I’m sorry you’re dealing with this, Cocco Bello.
Please note that our forum is a public platform, and we will modify your question to hide private, identifiable information in the description. Kindly ensure that you hide such details the next time you post to protect personal data.
From what you described, this looks like your Microsoft account has been compromised: someone appears to have changed the account’s sign-in address and password. The fact that your original Gmail address now shows as not associated with a Microsoft account is consistent with the sign-in information having been changed.
For such cases, Microsoft explicitly guides users who cannot log in to use the Sign-in Helper. It can identify your account issues and, based on detected situations, offer options to contact support staff. You may be presented with verification forms where you can provide the evidence:
I wish I could help you further, but unfortunately, Microsoft Q&A is just a public user-to-user forum. We cannot verify ownership, restore the old email address, reset the changed password, or manually return the Minecraft account from here. Those changes require Microsoft's account-recovery system.