Desire to do anything doesn't come to you as you wake up one day. Your environment influences you to get to that stage where you think you 'WANT' to be healthy and fit. The process shouldn't be forced on you.

Making fitness your lifestyle doesn't necessarily have to be about following a strict exercise and diet but about allowing yourself the flexibility to do all things with equal importance - your fitness, your personal life, your social life and work life without prioritising one over the other. Learning to respect your environment is the key!