There are different kinds of people some tend to live in a world of fantasy and do nothing to achieve it. They will spend their whole life agonizing that they didn't achieve what they desired. Then, there are people who don't have any real larger goals they just pass their time achieving short-term requirements they may be happy-go-lucky but their life is not so interesting as they don't have any ambitions or something to chase. Then there are those successful people who have real goals to achieve, who work hard to achieve them thinking day and knight about what they want to be and how to achieve them, they have everything pre-planned and well prepared for all aspects of life. They have the attitude to achieve what requires to be on top of the world and they work hard to achieve their dream.
The person who don't have a ambition in life is just any other person in the world... His/her life is hell lot boring. They don't have to do much & it may be possible that he or she may not enjoy the small things happening around them.There are two types of ambition one that is aimed for longer duration and one that is aimed for short term & these short-term goals should be made in such a way that it is ultimately directed to the achievement of the larger goals... So make an ambition for your self which may be achievable, but don't leave in the world of fantasy And prioritize the goals which need to be achieved first and that to be achieved in the longer term.
There are some drawbacks also in the process of achieving these goals people sometimes become over-ambitious and start ignoring the little things around them. It shouldn't be done in this way. Balance your ambition with the right amount of effort and enjoy all the sweet kinds of stuff around.. Leave happily...