No start in cold weather!

I tried starting my car this afternoon after not starting it since yesterday morning. It wouldnt start. I continued to try and it wouldnt crank over, it would only make the cranking noise as if it was going to. I depressed the accelerator all the way down and cranked and nothing. I did this for about a half hour taking 15 to 20 sec breaks in between, and still nothing. On the last try I did the same as I stated above, and it was trying to crank over so I pressed in and out on the pedal and it started and soon enough shut off on me. I had less than a half of tank of gas and I added some gas antifreeze and tried again and still nothing, just the noise. I then noticed an intense gas smell along with a burn smell, I opened the hood and noticed the spark plug wires had popped up along with a gas smell to it, and a white substance all around the one wire and spark plug. Could this be the end of my car? HELP PLEASE!