SUBARU QUESTION?!?-->5,000 rpms cruising on highway?

I drive a 2011 Subaru impreza wrx hatch.. I just got it two days ago and took it on the freeway. I in 5th gear, going 65 mph the revs are at 5,000 rpms, and it goes to 6,000 at 80 mph. Is this normal? it's making me worried. If so please tell me what to do to fix it. THANKS :D