Exercise?

I am so disappointed with myself. I exercised consistently for 8 weeks and now what am i doing, absolutely nothing. I am a lazy disgusting person. I have to do better, now that the days are getting longer i want to go to the track after work and run. The bad thing about exercise is that you know you need to do it, you feel so good when you do it, but when you don't do it you feel such guilt. I feel like a waste of space. This has got to change.