Old e-mail adress deleted, how to login?

A few years ago I made an wordpress for a class. I used my schoolaccount. Now, a few years later, my schoolaccount got deleted. So I have no proof of the fact that I am the owner of this wordpress. I want tot delete this wordpress, because I had to put personal information on it, and I want that deleted.

Any idea how I can login on my wordpress, or how I can get it deleted?