It’s been 10 years, 25 fights, and two UFC championships in two weight classes, but BJ Penn has a confession to make. At 32, things don‘t get easier for him in the moments before the opening bell.“I think the butterflies are getting worse with the years,” he chuckles. “I‘m surprised on that. I thought it would get easier and easier. I guess it was getting easier for a little while, but now I‘m up in my thirties, and I don‘t know if it‘s because I‘ve got kids or what, but it see…