Can I take over an account that someone used my email to create?
Is it because it's rightfully yours in your name?
Yes, this is my e-mail so it is my property, right?
That could be a slippery slope perhaps, the person might have just mistaken your e-mail for theirs if it's similar. It's still someone else's account, so I believe it's best to report it so they can change the e-mail and you can have yours back.
Okay, they will listen to me and believe in what I have to say.
If an account was not set up by you  it is best not to use it. You do not know who else may have access to it.