My God man - you had a PAIR!! Heads up even! What took you so long to get your chips out there? What are the odds your opponent had a pair, too? You get pocket twos preflop heads up, there's only one option. ALL IN, BABY!!! Sure, they'll suck out every once in a while, but with God, Mom, baseball, apple pie and a bottle of whiskey on your side, you'll always come out ahead in the long run.