Feeling dizzy but obs are fine...?

Okay so I feel ready dizzy and "out of it's but just got my blood pressure 101/68 and sats 96. My blood sugar was 3.6 or 3.9 cus I cant remeber which way round it was. So all of them are normal. So why do I feel so dizzy when I wapk and stand up? I'm 23 female by the way. Thanks
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