Knowing that I'll have to relive and relearn the damn primary school-to-high school experience of lessons...
Edit:
Actually, no, now that I think of it, it's more the thought of resetting the progress of previous life and knowledge that is pain and knowing that I had a past life that I was already settled in...
Also, do you sometimes dread looking into your inbox? Sometimes I do...
unlikely:
No one ever said reincarnation happened linearly in time, and 99.99% of all humans who have ever lived did not have to suffer through this indignity
Odds are, you'll end up way more impoverished than you are now
And I think that's my problem.... it's resetting my progress in life now, that's the main issue...