can I find out anyone of these (my email, user or pass)

Ok so I have my blog and I forgot my username and my password. I tried to go “forget your password” route and get it sent to my email, but I don’t remember my email I used for that blog.

Question:

What can I do? Can I find out at least my username or email somewhere in admin files or mysql database of the blog?

How can login to my blog in this situation?

Thanks for help!