Because you cannot have something as a 'right', if it requires someone else to be compelled to provide goods and services for you. Because then your right to food means that someone else does not have the right to the fruits of their labour.
Rights are something that can be enjoyed by everyone simultaneously. For instance, your right to travel does not mean that someone else has to buy you a car or a plane ticket - all it requires from others is non-interference.
The Universal Declaration of Human Rights disagrees with you. It says
> Everyone has the right to a standard of living adequate for the health and well-being of himself and of his family, including food, clothing, housing and medical care and necessary social services, and the right to security in the event of unemployment, sickness, disability, widowhood, old age or other lack of livelihood in circumstances beyond his control.
Rights are something that can be enjoyed by everyone simultaneously. For instance, your right to travel does not mean that someone else has to buy you a car or a plane ticket - all it requires from others is non-interference.