I surprised how people decides their aim?? Plz tell me HOW

There is no thing to confuse please. don't think all others except U are deciding their future goals/plans/aims. It is in deed very difficult for one to predict the future. and it is not possible also. At best , we can make out a try to achieve or become some thing or plan and we need to live accordingly. But it is the time , which tells every one that Beyond your aim/goal I AM THERE . yes., if the time is good u will achieve and finish or other wise, the time will finish us