Apparently this way of thinking can weird out some people, which I can only kind of understand. With my Catholic upbringing, I can remember as a child feeling scared because I knew that I would eventually die, but I didn't know when that would be. So I was worried that I might not do enough good things in life to outweigh the bad things I have inevitably done. But I've come to realize that I don't believe in a god anymore, nor an afterlife, and the knowledge that there is nothing after this life gives me a great sense of security. It's like a blanket can wrap my mind in, the comfortable knowledge that at one point we all will have our consciousnesses obliterated.
I feel like this life that we live is all there is, not a step in a journey, nor a precursor or afterthought to or from anything else. This is all there is. The "hereafter" for want of a better term, is completely devoid of all existence, therefore why the hell should we care, take the time to better yourself while you can. There is no reward for being a more advanced person, at least not beyond the obvious rewards in this life. But it kills the time until we die, and that seems to be what a lot of this life is about. Yeah, you could go live in the woods and go crazy by yourself, and that would be just fine, but most people don't seem to love that idea, and so they choose to live in a society. To be a member of society, you have to make money, or else you won't be able to eat or clothe yourself. But really, eating and clothing yourself are just things that are convenient to help the time pass.
People shouldn't be afraid of the "afterlife" because of the idea of eternity. If there is such a thing as eternity, then time becomes completely meaningless, and there may well be no end to an afterlife if it does turn out to exist. Yet if time is meaningless, then there is no beginning or end, and so nothing actually happens.