Absolutely, and I think not enough people understand or internalize this.
I think there are two responses to this - one is that the grand cosmos will not remember me, but my children, friends, and those I can mentor and teach will. You may not remember your great grandparents, but your parents do, and their influence influences you.
The second is that it takes a whole crew to sail a ship - I'm not the hero of the story, but my efforts can help accomplish changes I think are worthwhile in the world. I won't see the end of the journey, but I can help it along the way.