My headlights aren't turning on?

I've had so many problems with my 2001 Ford Focus se. The turn signals have always not always worked here and there. But I go to leave at night and turn my lights on and my dashlights turn on but not my headlights. My parking lights are on and no matter how many times I flicked it on and off the lights still didn't turn on. I don't think there is a fuse for the headlights on my car & I swear I just changed the bulbs recently too. Any idea what the problem is and about how much it'll cost to fix it?

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