Thank you for all of your replies so far.
I would like to think that I have sort of com to terms with it, even if it is on a very small scale. I am however having a bit of a hard time explaining things to my mother though. I have told her that at the age of 19, I am not going to grow much more, particularly how tall she was telling me.

Even if I used every single means of gaining height; human growth hormone and even cosmetic limbl/leg lengthening, I would not be able to grow to the heights she is 'asking' - asking being put in quotation marks, because she doesn't seem to realize that you cannot make yourself grow.

She also seems to be very ignorant/stubborn when I raise these facts, acting as if I could still grow taller, if I choose to.