The defender is determined to improve on his form from last season and take more responsibility at Signal Iduna Park as BVB goes in search of Bundesliga glory.
The Germany international has been a key part of the team since sealing a permanent move from Bayern Munich in 2009 following a successful loan spell at Signal Iduna Park, and he says he is ready to take more responsibility as Jurgen Klopp's men look to wrestle back the Bundesliga title from the Bavarians.
"It's important for me to take responsibility," he told Der Westen. "This means that I am not hiding in games. If I notice that something does not work in the team, then I change the situation for the better.
"You have to do this if you have played for the team for a long time as I have in recent years. And I will do it gladly."
The 24-year-old went on to admit that he was far from happy with his showings last term as he made a number of high-profile mistakes, most notably in the first leg of the Champions League semifinal against Real Madrid.
"I was not satisfied with my performances last term," he continued. "It was far below what I had envisioned and far below where I have to be. The number of blunders...
"These are things that are unbearable for me. Next season will be different. I'm taking every friendly, every training session, as seriously as a real game."
Hummels went on to say that he'll make sure his attitude is right and that the club would be looking to take back control of Germany's top flight.
"At this level, there are many small factors that can make you play better or worse. A bad attitude has no place here.
"[I want to be] better than last season. Second place is okay, but there were many unnecessary defeats, many goals we should not have conceded."