How to get abs in a week . . . or atl east a flat stomach?

I am exactly the same except I'm 104 pounds and 5 foot 3. I want to get a flat stomach and i DO live in Florida and I am in a bathing suit a lot and feel self conscious. I am trying to do sit ups, 3 sets of 10 every day. I just started so I'm not seeing any results yet. Try that xDD