Is it cruel and extreme to want to end the bloodline in my family with me and not continue the family bloodline?

I have had a difficult and complicated relationship as I came from a dysfunctional family and had rough relationships with them growing up and in my personal experiences as an adult I decided I was going to be the last generation after my parents and end my family tree with me being the ending of the family tree and passing the torch to my sister the ultimately the one to decide whether to continue the bloodline in the family but if she decides to continue the bloodline or end it with herself
Is it cruel and extreme to want to end the bloodline in my family with me and not continue the family bloodline?
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