is someone using my icloud email

Hello Kevc1986,

No one else can use your iCloud Email unless 1) You gave your password away (2) Your password is too easy to guess.

If you feel the need to change your password, you can do so using the instuctions below. I would definitely enable 2-factor, which will send a text message to your trusted phone number when trying to sign on.

The instructions in this Support Article will help resolve your issue:

-> Change your Apple ID password - Apple Support

Just you .., unless you gave someone your password.