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One of the exercises that we used in a writing course I took was to consciously imitate other writers. It was a non-fiction course, so we were imitating the likes of Orwell, Dillard, Didion and some others. It was fun and educational. If you're not reading writers with distinguishable enough styles that you can tell them apart, therein might lie your problem.
As for trying to make your PC's dialogue, actions and motivations different, try to make charicatures of real life people. While they might be a little one dimensional, and even annoying, at first (a guy who is driven by nothing but his libido, the girl who is a complete snobby bitch, the illiterate buffoon, the drunken bumbler), they can help you practice some different styles and experiment with different personalities. They might even surprise you in the ways they come to life and begin to flesh themselves out if you stick with them.
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