I've just installed Oracle 12c. I did not select any of the fancy new options, I just wanted an Oracle instance. I'm fairly new to Oracle but I was used to 11.2.0.4.

Every command I try now fails and it's always something like "Cannot do [x] on pluggable database", etc. 

I just want a normal oracle instance and I want to be able to create users and import my database but every turn I take has some frustrating error having to do with pluggable databases. I don't care at all about them, and I specifically tried to avoid any install option that looked like it would make a "pluggable" database but apparently it still did.

Is there any way I can just keep life the same in 12c or am I stuck with this entirely clumsy pluggable paradigm?
Thanks very much.