Bad surf

I recently went surfing since I was on vacation and havn't in like a month and a half. So anyway I paddled out at a pretty shallow point and every wave it seemed I would nose dive on my 7"4. I'm not sure how but I just seemed to lost my sweet spot and looked like a total kook. Its kind of a crowded spot and a local there was giving me pointers so I wouldn't get banged up on shallow reef. Does anyone get this problem after not surfing for a long time and maybe I should practice pop ups at home everyday or so since that seems to be causing me trouble.