When I was 14, I never typed like this. My posts were long, without punctuation, almost unable to follow by anyone, and it was even worse with the vocabulary. Being on the internet since 2002, and especially being on IRC since 2003 has forced me to change how I type if I want to be taken seriously. It was a very long haul into only a semi good vocabulary and semi good grammar. But if I type like this, I usually lose my train of thought, because my train of thought is so weird as to take to seemingly unrelated things. So don't feel bad, because I type immature too. I used to read a lot and used to get in trouble for bad english in my english classes, so I guess it also sort of helped with learning to type better than having a bunch of run on sentences (which I'm still bad at) and no punctuation. The worst thing that I am at now is context. I leave a bunch out because of my train of thought ends up jumping from thing to thing, and only slightly realizes the context I was thinking should also be put down until afterwards. So I also end up editing my posts a billion times too.
But like already said, I type exactly like I talk... but sometimes I can't talk all long-winded like this.
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--- ?Be who you are and say what you feel because those who mind don't matter and those who matter don't mind. ~ Dr. Seuss ---