I have to say, as an atheist I am a bit suprised by the notion that life without god might be not worth living. That sounds more like something an addict might say about life without his drug. But religion is not supposed to be a drug. (Or is it? Then who would be the pushers?)
However, obviously the problem is very real for you, and I guess also for a lot of other people. So I'll try to provide an answer.
You are asking if there can be a meaning of life without god. To find an answer, the first step I'd recommend is to consider the definition of the question. What do people usually mean when they speak of the "meaning of life"?
I see two common concepts:
A) The meaning of life is a secret task given to you before your birth. You'll have to figure it out yourself, but hopefully when you die someone who's supernaturally wise will pat you on the back and say: "Well done, son! You did the right thing! You gave your all and achieved all we hoped you would manage, and more."
Obviously, atheism cannot promise a similar secret destiny overseen by supernatural forces. However, I think the most important reason why that concept is so appealing is that you work for a purpose greater than yourself. And that is still totally possible without god. There are lots of worthwhile projects which contribute to a better society and a better future for mankind. You could also try to make a difference on a local level and get more involved in your community. Or you could try to contribute to the progress of science, or to an open-source software project. Or, the most obvious: Raise a family. :)
The possibilities are endless.
Remember, it is a common misconception that by rejecting god atheists also reject ethics and become egoists who are only interested in their own pleasure. However, if you always dreamt of giving non-stop partying a try, no one's stopping you. ;)
B) The second concept: The meaning of life is just something that provides you with enduring happiness and satisfaction. I guess most people discover after a while that pure pleasure-seeking and partying cannot achieve that. What do they try instead? I already mentioned raising a family, or getting involved in a humanitarian or idealistic cause. Others choose a life of ambition and competition, whether in sports, politics, business or whatever. That's probably not so idealistic, but nobody expects atheists to be saints anyway. ;)
I assume that religion was not the only source of happiness in your life so far. Just focus on the other things that inspired and impressed you, and build upon that.
Nevertheless, a possible problem for someone in your situation might be that losing religion not only left you without directions, but also charged your happiness with a straight handicap. That might take one of the following forms:
1) A feeling of guilt. A christian education often emphasizes that you should feel guilty if you do not believe in god strongly enough. Paradoxically, not believing in god at all would than result in an even stronger feeling of guilt. Despite the obvious logical contradiction, it's quite possible that your emotions cannot adjust so easily. That needs time and patience. In that case, I'd recommend focussing on the fact that you have a clean conscience, since your conscience now is only about what you do to other humans. God can take care of himself.
2) Loss of community. If being part of a church made you part of a lively community, it's obviously tough to lose that. Even worse would be if your friends and relatives are shocked and suspicious about the sudden appearance of an atheist in their midst. Hopefully, with time and patience they'll learn to deal with that. Otherwise maybe you'll have to move on. Lots of people have managed to start a new life.
3) Missing prayer. I suppose that prayer, if done the right way, can have a very positive effect on one's emotions. Atheists must get along without that. But they can find adequate replacements. You might try meditation, or seek the feeling of inspiration and awe that can be found within music, arts or scenic nature.
4) Fear of death. If one does not believe in a life after death, doesn't that make the thought of death to terrible to bear? From my experience, not at all. Of course almost everyone is scared in a life-threatening situation. But in that case you'd be high on adrenaline and probably occupied with other things than the philosophy of the afterlife. In quiter situations, it's trite but effective to remember that as long as you can worry about death your worries have not yet come to pass. :) I suppose the actual experience of death is probably not very different from fainting or losing consciousness in an accident. People manage to deal with that all the time. And even if you don't manage so well: It probably takes only a few seconds, and nobody will criticise you afterwards. ;)
I guess what could actually cause panic in the face of death is the thought that you have important unfinished business, or missed to do all the things you still wanted to do, or have not done anything with your life yet. But that's probably nothing else than the feeling of not having found the meaning of life, so that discovering a way of life that feels meaningful will protect you from that panic. If you work on a business that you actually and deeply consider important, then I'm pretty sure that even if death interrupts you before you can finish it, you will feel satisfied that working on it was reward enough.