I have recently started running and its not something I ever thought I would be able to do. I was a smoker for 13 years before my surgeon told me to quit and I was at your weight when I started running. I looked up a bunch of running tips before I started getting into it and my favorite one was to at first run slow enough to carry on a conversation. I felt sort of lame going so slow at first, but now a month later I am able to run 3.5-4 miles without stopping at all and my peace is much faster too. I know it's still way far from what you have to do to run a marathon, but I am pretty proud of myself