I'm jumping to conclusions a bit, but it sounds more like you feel you should be more informed on politics and world news, as if there's an expectation on you to be, rather than actually wanting to be. It makes all the difference. You can listen to music for hours on end and read entire books because you want to. If you felt you should do it because of some outside expectation I bet you wouldn't be able to spend half as much time on them. You just can't feign interest in things.
You're going to have to become invested in things to gain genuine interest in them. Do some background research, spark up conversation with people on the subjects, set a specified time aside to do whatever it is. But at the end of the day, if you don't have any empathy towards something or an interest in a particular area there's no point torturing yourself trying to become involved in it.