Where do story ideas come from? Our own lives provide a rich trove of material, whether from our own experiences or from our observations. We read the newspaper, watch TV, learn about other people's troubles and maybe get an idea...so we jot a few notes on our computer for future reference, and then come back to it every now and then. I have a file named ideas.doc with random one-liners that may come in handy some day. They might be possible story titles, character names, "what if" scenarious, snippets of dialog I've overheard somewhere. The idea isn't necessarily to use them all--I don't--but to not forget them and to have a grab bag to dip into.
It's said that Tom Clancy's idea for The Hunt for Red October came from a small news article about a missing Soviet submarine. One day in the early 1980s I heard an NPR report about Cambodian refugees coming to America. That led to an association with some of the refugees and to my eventually incorporating the experience into two novels. At work years ago I overheard two women talking about shaving their legs. One woman said, "If I had legs like yours, I'd get a guy to shave them for me." I scribbled a note right away, and it patiently sits in my idea file, waiting for the right time to use it.
So ideas can come from anywhere. Use them only as starting points, though. Never feel like you have to stick with "what really happened." That only matters for non-fiction.