Feeling extremely hungry and sick during fasting on day 5?

So I'm on one of these water fasting diets where I only during water and eat nothing for 2 weeks. The first 3 days went surprisingly fine but now I'm close to day 6 and my stomach is dying. I'm craving food... I'm hungry.. I can barley do anything and I think it's weird because most people online who did this fasting reported that they feel way more energized and less hungry so I come to believe I might do something wrong

Here some additional information about my weight I'm 5'6 (168cm), 23 years old and weight around 136ibs (62kg) and my goal weight is 110Ibs (50kg). I don't exercise but I do go for a one hour walk everyday to keep me active.