This seems to be a really common thing when you're still youngish. Middle age and beyond is when it becomes less daunting sometimes. Another user here mentioned being increasingly tired to the point that it does seem like it'll be the much needed release when it comes. But it really all depends on how you come to terms with it.

Something modern cultures lack that I've noticed is the inability to pass down oral histories of their families. They just casually wave them away like they're insignificant and get bothered if you try to pry a little deeper. Learning about your family history and how it's shaped where you are today really expands just how much each seemingly insignificant person has played a role in creating the society we currently live in and it's a tragedy that the practice of remembering them ("Ancestor worship" as the anthropologists stupidly call it) isn't common anymore.

The more spiritual approach isn't really about an afterlife either in the way it's been popularized with the Abrahamic faiths. Afterlife as I grew up knowing it was more that you would lose sense of your being as a human and merge with the overall energy of the earth, becoming a part of it on your own. All attachments you had in your life as a living being dissolve as the Earth takes your being and absorbs you with it. There are some complications with spirits and apparitions that only a select number of people can actually see or interact with, but this is reaching territory that probably sounds hokey to those who haven't lived in the culture.

Just don't obsess over it too much to the point it takes over your mind. Keep living and doing your thing, or take a step back to evaluate your life. Your impact will be felt whether you know it or not.