I guess I don't understand the desire to live forever. Do people really want suffer through daily life for eternity? Disclaimer: I barely make it through a week without thinking about not wanting to live though.
Whatever you do, at least don't undermine the science that tries to prolong life. I am not saying that you might have wanted personally to undermine it, it's just that the argument of yours (coming from similar people) comes up EVERY TIME eternal life is discussed.
So yes, I'd say it's worth it. You don't have to try to stretch it out indefinitely, time-wise, if that's not your thing. I think the key to our journey through all of "this", whatever it is, is to treat it as if it is, in fact, infinite (or rather timeless), even though our conscious experience of it happens to be stuck on a one-way track which makes it seem (to our primitive minds) like it's finite.
If, however, you are making an objective claim about "past lives" and reincarnation - there is no solid evidence for it. 99% of "past life memories" examples are in the form of "I had a family and we had a house" (omg, that sounds like our dead relative, you must be him reincarnated), or in a form of an obviously imagined past life of a historic figure, with details which have been read in history books by the individual claiming to experience the said past life. And interestingly they always seem to read about the historic figure first (giving their subconscious mind the change to soak up that knowledge (in this life though)), and "experiencing a past life" only after.
So to answer your question - because you only get one particular mind, and that's it. This is what science shows us. Whether you "feel like" you are "one with all other minds" is just a subjective experience. It's not physical reality.
But them I'm not sure we'd still be "us", anymore, by that point.
However, if one studies the experience itself, it would be very accurate to say that the soul is timeless. It is simply that there is no information about time in the feeling of a soul. It's not connected to any time-based experience.
It's like there is an object in the mind's processor that described the "soul". And in that object there is no field with the type "Datetime". It's not needed. The object can very well function without it. It is also very compatible (or rather accessible from) with any other experience, whether it has a Datetime field or not. One can think about the past, the present, the future, the Abstract - and one can feel the "soul" in any of them.
Since the experiences connected to the soul are really the only ones that seem to "matter", (being in this regard different from any practical life problems or circumstances), it behooves a lot to understand this timeless nature of it.
[1]: https://en.wikipedia.org/wiki/Regression_toward_the_mean, https://en.wikipedia.org/wiki/P-value is also relevant - consider "person has no unsolvable long-term problems and if maintained at their average level would live forever" to be the null hypothesis and "has a bad century and commits suicide" to be the observation.
That.. is not normal. Are you ok? Do you have a support network to just.. talk to about stuff?
Maybe try talking to a therapist just to see what's going on, no shame in that at all. Can work wonders just to talk about what you're thinking...
I honestly think I may have chronic traumatic encephalopathy but they can't really diagnose you without a brain biopsy. I got hit by a car and suffered several concussions in hockey and football where everything was just spinning. Sometimes I randomly blackout while working out.
Randomly blacking out is... not good. I'm sure that doesn't help.
Hopefully the psych will help but if, after 1.5 years, you feel the therapist isn't helpful maybe try a few different ones?
It's not an exact science and finding the right fit can be hard.
I guess you could say I want to know everything about the natural world, and it will be a long time before humanity learns everything about it, so I wish I could stick around to see all those discoveries.