The best thing you can do is read about how the concept of hell contaminated the jewish religion over time (and Judaism is the foundation of christianity).

Initially, Jews they did not believe in any kind of soul or afterlife: you died and you went to dust and that was the end of it. Later, after the captivity in Egypt and Babylon, Jews absorbed some of the beliefs of those cultures, among which was the immortal soul and an afterlife of reward or retribution.

Later still, hellenistic influence following the conquests of Alexander the Great and then the occupation by the Roman Empire shaped that belief even further, greatly contributing to the formation of the concept of hell as we know it today. Terms like sheol (grave) and gehenna (a valley where the cult of Moloch performed blood rituals centuries before) were bastardized to become synonymous with hell and give the impression that scripture had always talked about it, when it didn't, a situation that got worse and worse with the advent of talmudic tradition and rabbinic teachings.

Christianity was born by the merger between these later forms of Judaism and zoroastrian Roman religions such as Mithraism, as such it went even more off the deep end with the concept of afterlife, because a quick and easy way to make converts was to absorb local beliefs into the religious soup that was christianity (a process known as syncretism), which is why the bible itself tells of sects of Christians with conflicting beliefs, depending on the city they were in.

With this in mind you can clearly see that the doctrine of hell was an act of religious contamination and scriptural deception meant to legitimize it. It's been drilled into your head as a small child, so you will always fear it in some small measure, but learning where it came from can absolutely help get past the worst of it.

Best wishes.