Do it man. I run, and I easily give up, so I started slow, because I knew that I would hate running if I just pushed myself to the limit. Slowly I raised my overall time even more and more, every workout was a small improvement, until I got to where I am today. Combined with enough sleep and a good diet, I'm a different person now than when compared to the person I was before I started running. I surprisingly have more energy, feel less down all the time, and have a clearer mind than I did before. Do it!