Board size

I am 5 foot 6A 185 pounds.And I wear size ten shoe if any of that matters , but honestly , I feel like my eight point five is just way too big for me , is it possible that I just can't skate 8.5 should I go down and what size should I go to?

Honestly speaking , the board feels really big and clunky for me. I don't really know how to explain it, but my flips and flicks are inconsistent and my Ollie's are inconsistent.I can ride in ollie and ollie up on curbs, but its not consistent at all. And when I rode my friends board , which is a 7.75 it feels a lot better , but also feels really small. I have been skating for the past 2 years now and I feel like im not improving