120 fps double playback time

Hello,
may someone can explain me..
I tried Premiere CS6 while looking for a Programm to work on my GoPro Videos.
I imported a 720p 120 fps Video and is was playing "normal".
BUT, then i noticed, that the video, what should be about 15 minutes long, has double length about 30 minutes in the timeline and also when i export it with 60 fps.
When i play the source file it is 15 minutes long. In other Video editing tools, it is 15 minutes.. only in Premiere it get 30 minutes.
so why? and how can i change that to the original time?
i tried with "change speed" but then, audio doesn't sound original or gets asyncronous.
thanks
Christian

Thanks.. i got it now.. finding the "interpreate footage" in german language
ok.. changed it to 120 fps so the clip is no 16 minutes.
BUT.. playing it, the sound is like playing with double speed.
So now i have to "sync" the sound to the 16 minutes..
Update: The audio ends on the half on the video.
When playing it as 32 minutes the audio ends at 16. > Audio has correct time.
When at 16, audio ends at 8. > video "correct" length, but audio half.
i want to adjust the framrate (footage) of the Video. The audio should be untouched.
pfu.. premiere gets diffcult

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