A friend of mine recently asked my advice about running, and while flattered, I had to set the record straight that 15 miles a week does not make me the most hardcore runner. I boiled down the basics of running for me, though, in a few thoughts.
#1) You burn roughly the same # of calories running as walking (100) a mile, so if you don't like to run, walk. You just burn them faster running.
#2) To stick with any sort of workout, you have to do what you like. I don't love every single run, but I must like something about it because I have been running at 5 AM most mornings for 2 years now. What works about that for me is a) I like to run b) I am tired and lazy after school so I just don't work out and c) I don't like to get dirty twice in a day; once I've showered I want to stay clean.
I know tons of people who don't love to run. And I get that. I am a firm believer that people can be converted to runners, but I am not convinced that everyone IS a runner. If you're on the fence, read "Born to Run" or register for a 5K and try it out. You might surprise yourself.