A teacher of mine in secondary school said once, that the fact, that humans have only such a short time and are aware of it, builds a creative dynamic. It fosters creative and innovative ideas and brings humanity forward. At that time I didn't understnad, what he meant of course, but I certainly never forgot his words and pondered them often.
Of course, this doesn't help a single individual, but humanity as a whole.
But it helped me, to understnad, that things come and go, develope, take shapes rise and go down. Panta rei. It's like this in the universe, in some sense probably even outside of it (time and spacewise), in the nature, in science. I am just a little piece of it. Just as everything else, the thing that I call me, is just passing. It's just part of a big picture, of the whole flow. Was it already there in a different form, or will it be there? Noone knows, but who cares? I am not important enough to worry about this. Maybe I bring science a little further, maybe I find a new math formula. But if not someone else will find it. Panta rei.
In the meanwhile, I enjoy that I am here, that "me" exists. And that everything goes on.