Nah, if anything I might say it's a tad short. You probably just have to get used to it. 148cm is significantly longer than 140cm and like jgsqueak said, it's probably different from what you've ridden in the past. Back when I was 120lbs I was happily riding my 150cm board. I'm sure you'll be fine on it once you get used to it; length isn't the issue.