How do you feel about waiting for other's decision on you?

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Now I am applying my PHD study to several universities which are all top in US,and I am waiting for the offer.I just feel good about my background,but,you know,I am not sure that if they will give me an admission letter.I am just waiting.Do you have a similar experience?I mean that if you are waiting for something,for example,you apply a job and the employer says he would consider you,and he promises to send a message to you in a few days,how do you feel about that?Are you just waiting?Do you feel week and uncertain?What will you do during the waiting time?