Why am I so hungry on keto?

You haven't adapted yet, you haven't adapted to ketosis, there's something not right. I would check your carb levels. Your carb levels might be too high, and you may not be doing intermittent fasting, so you want to combine that because there is going to be a transition where you're going to be hungry, but we want to convert things to fat burning, and when you burn fat your hunger goes away, and that's the biggest indication that it's working.