If there have been any transactions in your wallet that you did NOT confirm, it may be that your wallet has been compromised.
If you believe this is the case, please submit a ticket to our support team at
https://support.metamask.io/ and click Start a Conversation
A live chat box window will then automatically appear on your screen where you may contact the support team.
It is best practice not to discuss a compromised wallet on the community forum. For your privacy and security, please continue all communication with us from there. The support team will be with you as soon as they can.
Here is also some more information on our Knowledge Base that may help you: