I’m mad at myself more than anyone else. After the Tigers beat the Twins on Monday night — in a game that the Twins traditionally have won in the past — I thought: maybe this is the turning point. Maybe this is when the Tigers overcome whatever mental block that stands in the way of them a) beating the Twins, and b) beating the Twins in Minnesota. Even Joel Zumaya’s season-ending injury couldn’t temper my enthusiasm. After all, the Twins lost their closer, Joe Nathan, in spring training and they’ve been in first place virtually all year. And then — poof — along comes Tuesday…and then Wednesday and, darn it, reality. I’ve long contended that the Tigers’ true rival in the Central division is…