Why do I have fatty eyelids?

My upper eyelids are fat and it’s not from allergies, and I was thinking its genetic but nobody from my family has eyelids that are large looking like mine. From my side profile it makes my eyes look droopy and people always assume I’m angry or sad when I’m not. I also get stared at a lot because of how awful my eyelids make my profile look. Would I need eyelid surgery or something? It concerns me and makes me feel really uncomfortable when everyone stares at me like I’m an alien. My eyelids also don’t swell, they’re literally just fat for no reason.
Why do I have fatty eyelids?
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