It doesn't bother me at all, so what I tend to focus more on how we can amplify the dignity of all humans while they are still alive, secure human needs for all, and to eliminate marginalization, which involves a whole lot of completely abolishing class politics and all it entails. the details of that is discussion for a different thread.
but to elaborate, you did not exist before, you were not conscious to fear non-existence, yet alone fear life. but lets look at this from a different angle, imagine if you were forced to live an "eternal life", that you don't get to choose and you are not allowed to stop this "eternal life" at any point. that sounds far worse than the certainty of non-existence. Not only would you inevitably become bored, but have no escape. So in my view, eternal life is only worth it if you have an escape at any time.
And don't get me started on the sheer misery of the so-called "good" ending of the after life that religions like christianity depicts. what they call "heaven" sounds like another version of "hell" to me. imagine being forced to worship a mythological cosmic tyrant who for all of eternity and you're expected to be happy about it. and if before you even die, you refuse to worship that being either because you don't have sufficient reason to believe they exist, or disagree with the tyrannical actions they are depicted to have committed throughout the holy book attributed to them, you get sent to an "eternal punishment". Either of these options are deeply sickening notions to me, and its all the more sickening to me that kids are taught that if they don't believe in this horrible mythology they'll suffer forever, scarring young kids with trauma in the process. So i for one am very glad these mythologies are fake, human made stories designed to control ancient populations behavior.
So yea, i don't mind the thought of non-existence, and it certainly couldn't bother me once i cease to exist. There are far, far worse notions out there in mythology than total non-existence.