Okay, here comes the religious answer.  If you don't want to continue reading, don't, but God has given meaning to my life, and he can give meaning to yours if you are willing.  And please don't just use this as an opportunity to flame religion - I'm just trying to help a guy find meaning in something.
Believe it or not, there is an entire book of the Bible devoted to this very subject of "meaninglessness."  The book of Ecclesiastes talks for chapters about how life and everything in it is meaningless.  It is a book of despair, helplessness.  But it provides a solution as well.  I'll admit that at times I have the same feelings as you, but I personally find solace in God.  I'll tell you why, from my own experience.  I live for Jesus.  I know that's a cliche, true, but it's part of my life.  I asked Jesus into my heart (and BTW, when I say heart, I don't mean the muscle that pumps blood - it is a figurative saying meaning the center of my being) for the first time when I was in the second grade.  I knew what it meant on a very basic level at that time, but that decision has come to mean co much more to me now.  
As a Christian, my meaning lies in the fact that I know there is a heaven, and that I will be allowed to go there when I die because Jesus paid my way by dying on the cross for my sins.  But that only covers my final destination.  What gives meaning to my every day life is my desire to spread this good news to everyone.  I live a life that is probably very similar to yours - 8-5 job, place to live, car, rent and utilities to be paid, etc.  But every chance I get I tell people about how living as a believer in Jesus has brought meaning to my life.  
If you're interested, please PM me.  If you want to tell me how it's all a bunch of bull, go ahead, that's your right to have an opinion.  Have a great day...