Your question assumes that I have a life now. People keep telling me to get a life, so I might have a problem answering you. :-P
Seriously, whether you believe there is life after death depends on what you believe about religion. If there is a God, then there is a good chance that we have a soul that survives after death. If there is no God, then it's less certain.
It's hard to tell whether there is a spiritual world around and beyond us that we can't see. Despite a lot of testing, no scientist has ever found a ghost, or confirmed a miracle. But, there are many stories told by people whose bodies have died for a short time and then been brought back to life by doctors. All of these people tell the same story, even though they've never met. They all went through a sort of tunnel of light, moving upward to a place of great peace and joy. Some describe reaching that place briefly and encountering God. If you are interested in these "near-death experiences," I recommend that you read the work of Elizabeth Kubler-Ross, who took down many such stories.
You also have to take into account all of the reports of miracles and visions that people have experienced throughout history, and continue to experience today. Scientists have found non-spiritual explanations for some of these things, but not all of them. They all point toward the existence of God (or many gods), and many of the visions describe an afterlife.
Your question leads to another important question: Since we do not know for certain whether there is an afterlife, how should we live in this life? Should we live in the way we think is "good," even if it's sometimes hard; or should we go ahead and do whatever we want to do?
The brilliant French mathematician, Blaise Pascal, looked at your question hundreds of years ago. He came up with a solution, which is known as "Pascal's Wager." ("Wager" is another word for "bet.") Pascal, who was a Christian, believed that the Bible contained God's advice for how to live. He figured that if there was a God, then God's advice for how to live must be "good." He also figured that, if there was no God, then there probably was no afterlife, either.
He said: "Okay. Let's say that I live my life in a good way. If there is no afterlife, then my life on Earth will be okay, but uncomfortable at times. If there is an afterlife, then I will go to Heaven.
"Now, let's say that I don't live in a good way. If there is no afterlife, then I've had an okay life with no discomfort, because I've done whatever I wanted to do. But if there is an afterlife, then I will go to Hell.
"So, if I live a good life, the best thing that can happen is that I'll go to Heaven. At worst, I'll have an okay life with some pains in the butt. If I live a 'bad' life, the very best thing that can happen is an okay life with no pains in the butt. At worst, I'll go to Hell.
"No matter what, if I'm good I'll come out way better, or at worst only a little worse-off, than I will if I'm bad. So, I'll be good."
That's how Blaise Pascal figured out that, regardless of whether there's an afterlife, it's better to live according to a set of good rules than to go around doing whatever you want. People all around the world still follow his advice today.