AM I ADOPTED?!

So I've always had a yellowy kind of skin colour (like Olive I guess?) But my family are all like a pinky white and pale af and like my parents always joke about my skin colour and say I'm the asian milkmans daughter but I'm genuinely worried that I'm adopted I don't think I look like my parents although me and my mother have a similar smile but idk I've asked them and they've said no but I'm still not sure. Am I overthinking this???