Well, if life is meaningless, what does killing yourself get you? Nothing. It simply goes against what your are programmed to do: live. Humans like to live. Hell, we downright love living.
Mountain - If you interpret events around you as signs, and you fully believe in them, I have no problem with that. Many people have seen signs. Look at Paul. Historically, he made a change. So something convinced him that he was wrong. I have looked for signs, and pleaded for answers from a few deities. No answers yet. At this point, I simply give up. Over the past 6 years of searching, trying different ways of thinking, I have found one that gives me peace. I think I will stick with it for a while.