Obsession is the pre-occupation of the mind with one thought, desire, image etc. which leads to useless pondering and thinking over the same. Obsession towards your dream and goals is always a healthy feeling. However, obsession towards one particular object, your love interest etc. can be fatal. An obsessed mind is a hyper-active mind and can never stay at peace since all the time an obsessed mind is fixated on thinking about its obsession. Obsessed people cannot stay relaxed and calm.
In life, one should not run after things and make them a necessity for us. Take things lightly and work towards all your life's goals with a light heart. Have faith in your hard work and believe that your efforts will certainly reap results some day. Hard work never goes waste. In case, you feel obsessed about some person, the best thing is to set that person free rather than making the person the focal point of your life. Certain things are best left to destiny.