Jumbled Up......!!

Hi,
I don’t know what is going on with me; I have started realizing that I am unable to handle the relationships in correct manner. Everybody around me is just so angry with me. I don’t know why all such things are happening, though I am constantly making efforts to fulfill everyone’s expectation that they have from me, but still I am failed.
One of my very good friends is very angry with me because I don’t give time to talk for just one or two days and that is because of my some very urgent work. Another friend who is also very angry just because I don’t have time for two or three days because of my office work.
What should I do, I mean should I always live for others, just to make them happy by listening to their problems, or by just be with them , by listening their achievements, or laugh with them in spite I have loads of tension on my head. What about me, what about my problems, what about my time, what about my work, Aren’t they important to my friends also as they are to me, don’t they think that sometimes I may also have some problems. I just can’t understand why I am always at the position where I have to just listen and console them or laugh with them or be with them no matter how much important work of mine is getting spoiled.
How should I change all this crap? After giving a thought to this problem I have found that, this problem has some credit to my time mismanagement also.
I can explain, like if I committed to some of my friend that I will give you a call at this time, and I just couldn’t make it on time, then it is but obvious that, he/she will get angry.
I just don’t know when it will get better or when I will change my bad habit of time mismanagement. You just can’t imagine that how much you have to suffer in life because of this time mismanagement.