Log in problem

Hello all.
I’ve got a problem logging in to my system.
Recently I’ve decided to move my wp.com site to wp.org.
I’ve purchased a hosting plan and downloaded wp, redirected my domain and so far all seems ok. When I go to mysite.com/wp-admin and try to log in the system no username on mine works. I’ve tried to get a new password but it says that no email of mine is the right email of that user.
I have no problem logging in to this wp.org site or to the wp.com so I don’t understand what could be wrong.
Anyone have an idea how solve this thing?
Thanks!
Adi