The feelings you have are not at all unique; you'd be a peculiar person if you didn't have them. Everybody has looked into a starry sky at some point in their life, felt utterly insignificant and wondered what the point was.
This is one reason God was invented - to create a point and to feel significant. (The other is to explain to children why granddad has died.)
Once you accept that there is no endgame, no reason for your existence or otherwise, life can begin and you can get pleasure from the small things in life.
Life, don't talk to me about life - Marvin the Paranoid Android