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So I used to be awesome at live 3/6 limit holdem
Playing live, you have to consider that it might have been your opponents who were awful.
As far as being a winning player - you need to consider how many hands you've played. I'm sure that you've been playing and winning, but are you sure you're a winning player?
If you win at one game over a couple of hours and lose at another, you can't say you're better at one than another. Winning live players can often go many months without consistent profits and winning online players can have downstreaks and breakeven streaks that last 50K hands.