electronic writing

I personally don't have alot of experience writing electronically. About 2 years ago I had a myspace and sent some of my friends messages, but im not big on myspace, facebook or twitter things. I like to text, though. I text numerous times a day. I used to spell words my own way.For example, instead of spelling "that", I spelled "dat". In doing this, I noticed that I was spelling things the way I texted in my english courses at school and this became a problem. Nowadays when I text, I text words the way they are supposed to be spelled. Some of my friends laugh at the way I text, saying that I text "too proper".