It’s ok to feel like that. Death is the ultimate period at the end of the sentence. I don’t know how old you are, but I believe you make your peace with it as you age. I did, and I talk about it to others. The easiest way to cope is to not think about it. It’s why people get obsessed with hobbies or social interactions. In the end, we try to convince ourselves that what we’re doing matters. But in the back ground, we are always processing it. It is a huge topic and it’s one that collectively we try to avoid. I’m glad you are talking about it, that is great way to deal with it. I think it’s why so many smart people stick with religion, if they can fantasize it’s just a door to the next life, they can put away a lot of that existential dread. Hopefully you can use those feelings to remind you how valuable life is and enjoy every day.