A lot of people think they can't be a runner. And most of the time, their reasons are really just excuses. They have bad knees. They don't have time. It's too hot. It's too cold. They could never do, XYZ.
Honestly, I don't buy any of it. As humans, we were born to run. And unless running will actually put your life in danger (i.e. unsafe locales, serious medical conditions), there probably isn't really any reason that you aren't able to it.
You just have to ask yourself what kind of fear is holding you back.
Are you afraid to fail? Then set small attainable goals. Maybe you start by running for one minute. Once you can do that, add another and another, until you can run a mile.
Are you afraid of injury? Then take precautions. Get fitted for proper footwear. Run in safe areas, where you are well illuminated and don't need to dodge traffic. Don't push through pain. (Yes, running can be uncomfortable, but it should never be painful.)
Are you afraid that you'll do something wrong? Then ask for help. Chances are you know a runner. Or that you live near an RRCA organization. Heck, even your doctor may be able to give you advice. The better informed you are the more likely you are to succeed and stick with your new found activity.
Whatever your fear is, big or small, it can be overcome and you can reach your goals. IDENTIFY the fear that's holding you back and ELIMINATE it. You just need to find the method that works for you. And once you've eliminated that fear and have become a runner (it only takes one run, no matter how fast or slow), then read the Complete Running Network's 100 Beginner Running Tips HERE. It's a comprehensive list that will get you on your way.
So, what are you waiting for? Can't you hear your running shoes calling your name?
Don't forget about the Sunfood Giveaway we have going on!