Longboard to Funboard

I've been renting a 8' longboard for about two years now and I picked it up immediately and have mastered it. I recently tried switching to a 7' funboard and in 3 hours only got up on about 6 waves or so. I felt like I kept missing the wave and would slowly slide down without catching the perfect break. If anyone knew some general changes in approach to a shorter board from a longboard I would greatly appreciate it!