Always having urges to eat even when full? why?

I’ve actually been like this for as long as i can remember. I had only started to think about it/realize it when i met my now boyfriend who doesn't “snack” or eat as many times as i do. The only reason probably that im not fat is because even though i eat many times, i dont eat a large amount each time. Just a lot of small-medium sized snacks a day. Also sugary drinks often. Its always a craving or an urge to eat. I always go out of my way to get it. Its always on my mind. Is there something wrong with me, or is it normal for some people?
Always having urges to eat even when full? why?
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