There are phases in life when we just find ourselves with no objectives. These phases generally come because of a chain of failures and our inability to accept those failures, which makes us give up.
In your case, you can't say that you are not interested in anything. yes, you are interested in getting interested. You know that you are lacking that and you are asking help and that clearly indicates that you have not given up and you ARE interested.
Find some small objective. It could be as simple as losing some weight or gaining (whatever is the case) or building some muscles. Which makes you exercise on regular basis. Well, this is just an example but if you can start trying for that small objective, that would itself make you more motivated and happier. And when you achieve it, you will automatically be looking for setting another objective. Just say in your mind that "Life is beautiful" and try to decide on a small objective. Believe me, you will see a new person taking birth inside you soon.
best of luck.
You must work for Harry Reid. He has no interest in anything either.
I'm not gettin any interest either. It;s the damn Fed and their screwed up monetary policy.
try google it also