So I'm pretty new at surfin (couple months)... have a long board and and a short board but was thinking of getting a fun board.

The one I saw for a sweet deal on is a 7"6' and I wonder if I shouldn't go a little smaller? I'm 5"6' 115lbs

Wanna have the fun of a long board for smaller waves but little easier to move around... And maybe duck dive it. I doubt I can duck dive a 7"6' tho ... Should I go smaller?