50 Cent “wasted too much time” arguing with his rap rivals. The 49-year-old star has feuded with the likes of Ja Rule, Fat Joe, and Cam’ron during the course of his career, but 50 now looks back on those situations with some regret. Speaking to The Hollywood Reporter, the chart-topping rapper explained: “Look, I think we wasted too much time arguing, me and Fat Joe, me and Cam’ron. “There’s other guys like Jadakiss, we cleared it up easier. But we wasted time because it was just the competitive nature. It wasn’t like we crossed paths and had real heat for each other. It went on more with Joe b…