It could be your drugs.. talk to your doctor.
But seriously, why don't you give it meaning? Go out and do what YOU want to do. What have you always wanted to do? Go do that. Right now. Don't wait. You know that stupid saying that you could die tomorrow, well you COULD. And you WILL die eventually. Why not make it worth living? We don't last very long anyways.. It might not be very "practical" but then again what is money.. just paper. Find out why you want to live. Appreciate beauty in everything around you. Love yourself and others.
I know how you feel. Sometimes I feel like there is no point to anything, like living. I try to look at everyday like an adventure. I go out and do things on impulse, I tell people what I would tell them if I was going to die tomorrow. It might not be the "safest" policy but hell, it is fun, and it gives me some meaning at least.
Trust me, I KNOW it's sooo much easier said than done. But if you want something changed, YOU have to change it. There's nothing I can say that can give your life meaning, you have to find that on your own. Focus on what makes you happy for now. Good luck.