Again, I think you are imagining "a long time" rather than "forever." What could you possibly do forever that wouldn't become unbearable after awhile? That is, unless you were in some sort of permanent blissful state that has no feel of time passing, in which case you wouldn't be you anymore.I don't fear living forever either. I don't even understand how it is possible to fear living forever.
I disagree with Paul. I don't believe in the alternative b, and I would change the alternative a as follows: I'm going to exist forever and there is no possible way this won't be absolutely delightful.
Eternity is a very long time, especially towards the end. ---Woody Allen