Your body is a direct reflection of your mind. How you look reflects your habits, mentality and discipline. Would a wise man want to be weak, live a worse life and die early? Fixing your body should be priority no. #1.
I can highly recommend my audience to pickup a copy of Starting Strength book or start the Strong Lifts 5x5 program for strength training. The discipline, short term pain for long term gain will make you mentally strong and give you upward momentum, alongwith making you physically strong. It changed my life. I am sure it would yours too.