Initially a lot more, because of the shock and the will to ba back to my world, among humans, living the life I’ve been living my whole life. I wouldn’t want to die alone in what looks like an unexplainable minecraft world.
I may, eventually, reason that for such a thing to happen bigger forces must be at play, so I may just willingly try some form of suicide out of curiosity, so in such a state I would be a lot less scared.