My car just stopped working?

Okay I have a 2001 Ford focus Se and was coming back home one night when it just shut off. I pulled over and put the car in park and sat for a minute before I turned the key to start it and nothing happened. My dash lights don't come on or anything but my dome lights are bright (when I turn them on) and I can blast the radio? The car acts like the key isn't turning because my dash lights won't come on and my headlights won't come completely on (only parking lights) unless the key is turned. I tried to jump it and it still did the same thing. I have recently put a brand new alternator in it about a week ago and the battery about a year ago. Can someone please help? I'm 16 and this is my first car and it's stuck away from home because yet again you can't put it in neutral to tow unless the key is turned!

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