Why feel bad?

I consider myself a good person (who doesn't?) but I always seem to find myself feeling bad about situations I have no control over. There are many times where I feel extremely stressed over a situation where it is completely not worth it and I know the person or persons causing the stress could care less. For example for the very select few times that I had to miss school in my school career I have felt extremely bad and I just don't understand why. Most people don't really care too much if miss school as long as it was unavoidable and because there is nothing they can do. For me though even when I always have a good reason to miss school I still feel bad for doing it. It is also extremely stressful when the person doesn't care or believe your reasons. I guess I feel like I am a good person and the person has no proof otherwise so what makes them believe that I am bad or don't care? Also what makes them think I should be treated like a delinquent because of situations beyond my control? I feel like it is quite obvious to read people and to recognize whether they care are not, so why treat everyone the same?

Another good example would be caring about others before myself. I am the type of person who worries more about others then myself, while their is a lot of people in the world who have no problem only worrying about themselves.. I guess I feel it is easy to do what you want but it is more difficult to do what is best for others especially if you don't like it. I believe the world would be a way better place if people cared more about other then themselves. The thing that gets me the most upset is those commercials where they show starving dying children living in trash. I am not upset about the visuals, its the harsh reality, but what upsets me is that these organizations have to go to these great lengths to try to convince people to help someone they don't know. I feel like until we get to a point in our society where if someone says a child needs money for food people would give it no questions ask we will be a doomed society set for self-destruction. There are people out there who just don't care and it is almost impossible to change they position so why do I feel bad? I don't know why and I don't know why I care about anything in general consider people only care about themselves. I guess that is something I have to search for throughout my life and I sure hope I can find it.