Definitely the wrong board for you. I'll offer you $100 for it. :)
Seriously though, it's not so much the length but the stiffness. You're at the lower end of the recommended weight range. If you are an aggressive rider, it may work for you. Otherwise, it might hamper your riding since you may have trouble decambering it. In powder, stiff is okay. In crud, I like something a bit softer so that it absorbs the irregularities.
I'm not sure how old you are but if you're still growing, hang onto the board. It has no expiry date.
If you decide to sell, I'm sure you'll have no trouble getting rid of it.