I hope not be giving out your user and pass now or enter into free scam software program for free minecraft premium account
Or Contact Mojang, not random strangers on the interwebs.
They might be able to help you if you can provide other personal information, like biling information, etc. Unfortunately, they are not necessarily obligated to do so because the EULA makes your account your own liability.
Or this You can only get it back if you have your email (in which case you go to minecraft.net, go to login screen, click forgot password).