Ben Affleck: I Want To "Serve As An Example To My Kids"

Pearl Harbor star Ben Affleck, 39, and wife Jennifer Garner are set to welcome baby No. 3 any day now - but that's not the only thing on Affleck's mind.

The father-of-two founded the Eastern Congo Initiative in 2010 and recently got back from his eighth trip to the war-torn region. The actor says it's his daughters - Violet, 6 and Seraphina, 3 - who inspire him to do make a difference in the world.

"I got to a point in my life where I felt like I had been very fortunate," Affleck tells PEOPLE. "And I wanted to do something more with my life than just make movies and try to make money. I wanted to do something that was important to me in other ways and would serve as an example to my kids."

In an effort to raise awareness for the cause, Affleck launched a Facebook page Wednesday to share pictures and stories from his trips to Africa. His nonprofit helps support Congolese-led organizations helping to rebuild the region, from groups aiding former child soldiers to those supplying health care to those in need.

"The people there are working as hard as they can to make their lives better," says the Academy Award-winning actor. "And that's inspiring."

The doting daddy says he shows his daughters where he's going on a map when he travels to Africa. "I tell them it's important to be involved in the world in way that help others and not just yourself," Affleck says.