I missed a class somewhere

Text messaging has become the thing these days, I can understand taking shortcuts when trying to type on the phone. But when you have a full keyboard in front of you, I still do not know how they do it. My two nieces are the worst. Wat ya do n, chil n, b der n a min , nut n mch. I have sit here and tried to type by using these abbreviations and no matter what, I have to look at the key board. My brain will not let me do it. If you get a chance try to type using abbreviations like that and see if you can do it. On the cell it works just fine , but on the computer it drives me crazy.