There is no magic, easy solution to doing this. The only way to make this happen is through an effort to think critically. In order to do this, a person must start with the smaller, more personal things in life and then try to ask questions about them. For example, you could look at the fact that you are in college while other people your age are not. You could then ask "what is it about me or my background that would allow me to go to college while others do not or cannot?" You would then need to look at each fact about yourself, from your race to your sex to your family's income to what religion you are. You would need to ask yourself which, if any, of these could possibly have helped you get to college where others could not.
The only way to change your "angle of vision," then, is to try to think critically and creatively about the details of your life (or that of another person or group) and try to brainstorm ways in which broader social forces affect those aspects of life.