Am i overeating or am i actually hungry?

So over the last year ive lost about 20 pounds im now at about 105-7. I initially just wanted to get down to 115lbs but since the weight kept coming off now im adamant about 100lbs. I started off by intaking 800 cal, then 1200, then 1400 and more recently about 1500 but this is the problem ober the last four five days, i just cant stick to it and end up overeating at 2,000 because im just soooooo hungry at night and end up feeling really guilty because i know i wont get to my goal if i keep doing this but my stomach literally groans and moans. I dont want to starve myself but im also afraid of gaining a ton of weight beacuse im always hungry even when ocassionally take in 2,000. Any advice? btw im 20 and my height is about 5'2ish