You may have a serious, but treatable, condition known as "1337aphasia". Signs of the illness are the exactly the ones you've described: speaking in 1337 in real life.
In the past, the only effective option for this was electroshock therapy; but this was incredibly painful and often left the patient with a loss of some brain function.
Nowadays, a new therapy is used, called "No-Internet Treatment". It requires that you avoid using the internet until your behavior returns to normal. Of course, this brings with it "internet withdrawal", which itself causes some problems...