> The trip is far more awesome than anything I have planned for the rest of my life.

If you would give your live for a single awsome trip (and you would still have multiple years to live), then you are likely suicidal.

Even if it is rational because your live sucks so hard, I would still have to classify you as suicidal.

Is jumping on a grenade to save another person suicidal? Or is it just a matter of you not agreeing with the rational?

...no? It's the same as when you say you'd 'die for somebody'. I don't want to die, but if I had to die to save my family I would. That's not being suicidal. Similarly, if space is important enough to you to take this risk (which realistically is a pretty low risk!) I wouldn't call that suicidal either. I take the risk of death driving in my car every day; that's the nature of life.