Thinking the way others don't

Hi Friends,
Its like everything depends on how we think , what we do and finally how do we react...or say if we react the way we think. Actually most of the time the above conditions together never falls and here's the problem arise. You know what life would be really smooth if we could implement easily the pre-planned things. Just think why we get upset most of the times , its just because things do not happen the way we wanna do. The only mantra to get out from all of these is basically moulding ourself to the present happening condition and understood the fact that its something which is actually good for ourselve only and it is well known appreciable quote that everything happens for our own goodness buddy.