Death help

I tried to think that there is afterlife cause it was too hard for me to accept being nothing for all eternity. But, it is too hard for me to change my mind. So from people that thinks that death is really the end and completely nothing, how did you get over fear of death? Also, I want to spend this short life that I will experience only once as meaningful and good as I can but, I don’t know what to do with life and, whatever I do it feels like it is meaningless and sad cause it will one day end completely.