I definitely think it will be the Japanese who figure this out first

The USA has plans for this, hydrogen production via nuclear power, in fact, most of the world does. It's not restricted to Japanese, sorry if this isn't Kawaii enough for you.

Am I wrong about the tritium thing? There isn't enough in the world to run a single fusion plant at this time.

its taken so long to get fusion working because the aliens that crashed in roswell and told us about it knew we had no way of figuring it out anytime soon.

That’s actually a good question. I’m not sure how adequate current tritium stocks are, but it’s quite easy to produce. What’s done now is to insert lithium aluminate targets in a regular fission power reactor, and create tritium from the neutron reactions with lithium. I have a feeling that it could be mass produced pretty easily. We make it in great quantities to keep the fusion triggers on our nuclear weapons primed and ready, since it’s got a half life of about 12 years.

Exploration is happening in computing, artificial intelligence, and medicine. We're approaching an inflection point with AI in particular.

I just hope to live long enough for the crisis of sex robots going rogue and killing people

Honestly with the advances in AI, brain-chip interfaces, and robotics, we're not very far away from tech like in the movie Surrogate.

we live in the atomic age 2 and will end up all being poor and unhappy when we enter the atomic age 3 just like we are now

There will always be poor people, and people will never be happy. It's the human condition.