How do I stop worrying about my salvation?

I am Christian, but I keep worrying that I commit an unforgivable sin. Furthermore, I'm concerned that I am not of the 144K. How do I get over this sort of stupid worrying? God tells us that he sent his son to die for us, but Calvinism and Islam straightly contradict everything the Bible teaches. Or do we... show more I am Christian, but I keep worrying that I commit an unforgivable sin. Furthermore, I'm concerned that I am not of the 144K. How do I get over this sort of stupid worrying?

God tells us that he sent his son to die for us, but Calvinism and Islam straightly contradict everything the Bible teaches.

Or do we just get no afterlife and disappear after our 75 or so years on earth?
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