Please post up your foot size as well. Burton rates the Custom X 160 at 155-195 lbs. It is never a good idea to go outside of a manufacturer's designed weight range. Can you ride it, yes. Will it feel user friendly, no. This board is designed to flex naturally for a significanly heavier rider. You will have to stay on it to get it to flex correctly and even then...
Have you ridden it yet? If not, let's get the rest of your info and set you up perfectly.