Why would my vitamin d level be a little low when I do the right things to make it normal??

I am a 21 year old female. I just got bloodwork results back! Everything is fine and normal but except it say my vitamin d is kinda low. It is so strange because, I don't do the things that deserve low vitamin d. I am in the sun a lot, I eat a balanced diet due to vitamin d foods. How frustrating is that?! I... show more I am a 21 year old female. I just got bloodwork results back! Everything is fine and normal but except it say my vitamin d is kinda low. It is so strange because, I don't do the things that deserve low vitamin d. I am in the sun a lot, I eat a balanced diet due to vitamin d foods. How frustrating is that?! I don't usually eat dairy though! Does anyone know why my vitamin d will be low than???
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