Do you have a specific reason for talking so much? Is it out boredom, are your classes not challenging you enough so that you don't feel the need to focus as much?

If it's just a matter of self-control, unfortunately, that is something that must be learned from within, though it does help if you put yourself in a position to succeed, such as sitting closer to a teacher or away from other talkative people.

In the end, talking in class isn't a bad there per se, so long as you get your work done and aren't disrupting others. If that's the case, then try to just calm it down a bit, pick and choose your spots to talk.

Take care all.