@ IHI Sorry, but some of the sentences in your OP did come across as rather grandiose and egotistical - and pretentious, to be honest..
Like this one
"I'm an incredibly deep thinker and I use my cognitive abilities to tackle The question... The meaning life, the universe and everything (as Douglas put it.) I've thus exposed my mind to the unimaginable durations of time yet to come and the fate of humanity in it's wake."
I mean, really? You do not think that sounds egotistical? And, again, to be frank these "dilemnas " you ponder are not as grand and deep as you make them out to be - again, to be honest, they are somewhat sophomoric.
And then this one;
"If you, as I have, expose your mind to the vast time frame involved and contemplate our believed fate of our species, doesn't it strike you as pointless to do anything useful with life? "
I mean come on, really? Do you imagine no one else has ever thought about this kind of thing? That no other philosopher or scientist or heck, even a 6th former after their first experience of pot has not thought about this kind of thing?
They are interesting questions, sure, but not anywhere near as portentous as your post makes them out to be. What meaning your life has is what you make of your life now - How you interact with the world around you, not what might happen in 5 billion or 100 billion years from now.
If you are defining your existence by existential questions about what might or might not happen in some unknowable, distant future then you are not taking full advantage of life right now, IMO...