SC,
Consider a guided meditation. I enjoy this one:
https://www.youtube.com/watch?v=5M1hP4RfS-c
The fear of death is normal, and it can be troubling to realize our mortality. There will be peace, keep at it. There will be concentration, joy, keep at it. You will not become immortal, but you can have pervasive peacefulness despite your mortality.
With warmth,
Matt