Calling the DNA and the life it produced worthless seems a bit simplistic. Consider e.g. worker bees, which are infertile and rarely reproduce, but are certainly not worthless -- they are crucial to the success of the hive. This is an example of kin selection. [0]

[0] https://en.wikipedia.org/wiki/Kin_selection

worthless is a human value judgement. biologically things don't have a purpose. those with more successful traits on average passed these traits down.

evolution is just things happening. there's no goal, no purpose, no meaning.

I guess you are saying to yourself "I am worthless" every time you put a condom on... :|

I love this analysis and I think the faster you come to terms with it, the easier life becomes as a single man.