I have found many sub-domain of my site which i did not create and are not available in my account. How do i remove them??
What is your domain name?
Once your issue is resolved,
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"keeps showing up on internet" is an interesting phrase. How, where?
The only way I can think of is when you use one of the services searching through databases of existing, or even old, certificates. If that's the case, then it could have been from the time before you purchased your domain, by its previous owner.
But I'm really curious - can you send in any more details?
I've worked around (not only) SSL security for over 20 years in enterprises and startups.
I am now running an HTTPS expiry management service KeyChest.net