Transitioning to fish hybrids

I started with 9" but I bought a 6"3 fish hybrid. I was able to catch waves but I can't ride on the unbroken part. It just feels so different! When I take off, it feels like I have to press down the front of the board hard. So my back and front foot are so far apart that it just feels unnatural and I'm stuck in that position.
I also don't get the glide feeling I get normally on a longboard. I'm not sure how to explain it but it feels like my fins are stuck onto the wave and I'm just getting pushed. It doesn't feel like I'm riding the wave more like I'm stuck to it and can't get out of it so I can't turn into the unbroken part of the wave.
It's really frustrating but I'm back to training on the white wash again. Because duck diving drains my stamina out too fast and I can only do that for about an hour. It's only my 4th or 5th time on the shorter board. I probably get like 1 good wave out of the 10 I catch. The rest are just like riding white wash...
I can attach some photos if it helps..
I also don't get the glide feeling I get normally on a longboard. I'm not sure how to explain it but it feels like my fins are stuck onto the wave and I'm just getting pushed. It doesn't feel like I'm riding the wave more like I'm stuck to it and can't get out of it so I can't turn into the unbroken part of the wave.
It's really frustrating but I'm back to training on the white wash again. Because duck diving drains my stamina out too fast and I can only do that for about an hour. It's only my 4th or 5th time on the shorter board. I probably get like 1 good wave out of the 10 I catch. The rest are just like riding white wash...
I can attach some photos if it helps..