Terribly unfit...

I got my first road bike last month, but only rode it a couple of times so far, August is usually a rather busy month. I'm only 19 so it's quite shocking, but I've pretty much done no sport or regular exercise since I left school, relied on PE too much.
I can do about 10 minutes on a bike before I start to feel a bit sick. Are there any specific exercises I could do at home that would help? It's quite pathetic that I can't go so far.
I'm probably in need of a decent diet as well. I eat 3 of my 5 a day, but I feel I need to majorly improve as Kit Kats don't seem to help, oddly. Any certain foods I should eat?
I can do about 10 minutes on a bike before I start to feel a bit sick. Are there any specific exercises I could do at home that would help? It's quite pathetic that I can't go so far.
I'm probably in need of a decent diet as well. I eat 3 of my 5 a day, but I feel I need to majorly improve as Kit Kats don't seem to help, oddly. Any certain foods I should eat?
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This is all from personal experience. I was totally imobile christmas just gone. Ive lost 47 pounds gone from 15 miles to 105 mile rides done my first circuit races and TT's all by simple diet and exercise control.
Youve taken the first step now push on!
I'll go out for a ride on Sunday, and I'll try and take it easy, as well as increase my route a bit. Maybe I was trying to be Bradley Wiggins, I have to keep telling myself it's going to take sod knows how many years before I get anywhere near half his ability. I'm not sure I had eaten properly in the morning, but I try and give my breakfast of shreddie's at least an hour to settle in.
I'll no doubt be back, but cheers in the mean time!