Oddly, I approach this quite differently. I have a chance to make life better for myself and others around me. I know one day I will no longer be here to effect that change and that makes each moment all the more special because life is fleeting.
The sad reality is that you are no more special than everyone else. You are, at the same time, no less special. Immortality has no bearing on this as you would still be in the same boat as everyone else.
Negative think much? I'm a strong atheist who doesn't give a damn if there is a hell or a heaven, though I am confident that neither is an existential reality. I simply fail to grasp the validity of your crisis.
Attitude is king.
I don't view myself as more special than anyone else. But continuing on here. Most of us as human beings have an innate desire to continue surviving and to be happy (eternal bliss). It is the reason why so many people wish to believe in an eternal blissful afterlife and don't wish to die.
Most of us as human beings are simply hardwired for that which is the reason why it is the #1 thing in life. Our brains perceive our survival and happiness as the #1 thing since that is the natural way our brains work. So that is why the existence of an eternal blissful afterlife is so important to me.
If it doesn't exist, then I wish to deem this life as meaningless to me and not worth my time. I would be so glad to completely destroy all the value this one and only life can have. I would be so glad to just rid of this life.
Also, thank you for trying to give helpful advice anyway. But thinking of myself as special and valuable always creates that conflict I mentioned. There is no way past that conflict.
Whenever I think of myself as special and valuable, that causes me absolute rage since it is the worst insult to that value and specialness to have me just forever thrown and decayed away. It just doesn't work for me.
So, like I said, the only way for me to remove that conflict would be to deem myself as nothing special and nothing valuable at all.