My minecraft account won't log in?

I made a minecraft account and bought it with my step moms email but then i changed it to my email and now when i log in it only lets me play demo and i don't know what to do. I have money to buy a new minecraft account but i don't really want to have to

Have you tried both emails?

Also an email would be sent to your step mothers email address asking you to confirm the change of email, if you did not do this it will not change.

No