I reckon you are who you are (or as Ke$ha says, we R who we R). You can try to play dumb for a while, or you can try to be effusive bubbly, but eventually either you'll slip or people will see through it, or whatever. That doesn't mean you can't try to improve yourself. If you are weak at tactics, try to study other games, use a simulator, etc. If people don't like you, try being friendlier, work on developing bonds, don't call other players pathetic morons and fucktards in global, etc. I think all that only goes so far, though. Fundamentally, you are who you are as a player and I don't think it really changes that much.