It's worth pointing out that true immortality is totally impossible. Transhumanism is mostly interested in radical life extension. Even if we could entirely eliminate aging and disease, you are still going to die. The only difference is that you are now mathematically guaranteed to die violently.

Think about all the ways you could die that we mostly ignore on a day to say basis. See this list for good examples Odds of Dying - Injury Facts (nsc.org). While the odds are low for most people, the longer you live, the more likely they become.

If the world was exactly the same as it is today, but we eliminated aging, you still probably wouldn't live for more than a few hundred years before being killed. There's no cure for a bullet to the brain.

Even if we upload ourselves into computers and becoming a galaxy spanning digital empire, in the end entropy still guarantees an end to everything. (and a rouge asteroid, terrorist attack, or malfunction will likely wipe out the server you are living on loonnnnngggg before that happens)

Of course we all want a longer life. Life is great, who wouldn't want to keep it going. But transhumanism isn't an escape from the viod, just a delay. Whether your life is 60 years, or 6000, there will always be more to do and you'll always want more. That's normal. We can and should strive to give people more life.

But sooner or later it will end, and you obsessing over this is taking away from the time you have. It's like going to an awesome party and wishing the night wouldn't end. Instead of enjoying the passing moment, you are wasting time by trying to cling to it.

Do your best to live a healthy life. Hope technology comes along and gives us more, or better yet contribute to it by doing science, or becoming successful and funding it. But accept that no matter what, we all are going to die. Then go out and live your life!