Always losing more hands than I win

Does anyone else find that they lose more hands than they win? I'm surprised that for a game that is almost 50/50, I lose more than I win.

I'm not talking about the AMOUNT of money won or lost. I'm talking about the hands/games played. In theory you should win about half the games you play and lose half. But I find overall I lose way more than I win.

How could this be? An I really unlucky or could I start suspecting that the cards are being shuffled in the machine after bets are placed?