My URL apparently isnt mine ?? Help

I have only barely used WordPress but am ready to being.

Back in 2007, though I thought I did get WordPress “accounts” under my website name “Teamkong”

Later that year, my host made WordPress available thru them so I started to use it a bit

https://www.teamkong.net/blog/ I know its blank now. I can login to my webhost here: https://www.teamkong.net/blog/wp-admin/

I do not care about any of this, I just want to have my blog be https://www.teamkong.wordpress.com but it says its already taken, although its not active.

I am positive I am the one who registered it, but how can I find out for sure. Please someone help me. Thanks.