How quickly hair grows back differs from person to person. Just like when you're a baby, your hair grows over a period of time before it got to whatever length it was that you were used to, doesn't happen over night. I understand you wanting it to grow back fast, but you just have to be patient, take care of it to the best of your ability and just let it do it's own thing. In due time you shall start to see the progress that you want, but until then enjoy learning about your natural hair and embrace it's natural beauty. Remember a good thing is worth waiting for, just remain strong minded and don't stress