It’s even worse than that. Taking into account the spreads, you will lose money in transaction costs.
@TheTexan1984, the only valid reason to be simultaneously long (in a buy position) and short (in a sell position) a given currency pair, is because you are running two different trading strategies that use different buy and sell signals. Even then, it might be best to run these two strategies in different accounts, so you can track their individual performance.
If you are long and short simply because you lack the conviction to choose a direction, then you are better off being flat (having no long or short positions), because then at least you will save yourself the transaction costs.