Well, you are gonna wake up from every dream.

Your awareness raises with each second in a dream, so the first times that you LD, your awareness will be at its peak right beford you wake. So this will often cause you to realize you are dreaming and wake up.

Control comes with time, you weren't doing anything to stop the scene change, so the dream just keeps going as planned unless derailed.

Control comes with either changing the dream scene or keeping it the same. Both take time, both tale practice. I have some threads on control here.
Dream Control and Stabilization

Let me know if you have any more questions.