Of course it's true that existence is something that is so temporary and meaningless, life does lead to nothing and nowhere other than us inevitably ceasing to exist where this existence won't even exist as a distant memory. So while there will be an end someday no matter what, it doesn't take away from the fact that this world is such a hellish place to exist in with unlimited potential for us to suffer.
I do see this temporary and insignificant existence as being something to worry about, as if I don't ctb this could go on for decades longer, and to me existence is something so horrific because everything is so unpredictable and uncertain, there is no relief from the fact that existence is something that is so incredibly harmful. I don't wish to end up in a situation of even worse suffering and for me the problem lies in the fact that there is no straightforward way to free ourselves from this burden that was so cruelly forced on us.