not usage

[navi tasan]

Are these sentences correct:

1-He didn't like his life, the life that was ahead of him.
2-He didn't like his life, not the life that was ahead of him.
3-He didn't like his life, not the life that was ahead of him, but the one he had had until then.

I think 1 and 2 mean the same. Obviously 3 means something quite different.
My problem is with 2. Can't it actually mean two things?
a-He didn't like the life that was ahead of him.
b-He disliked his life, but not the one that was ahead of him. If I saw that sentence I'd assume it meant 'a', but isn't it possible that it could mean 'b'?

[RonBee]

The first one would be better as:
.

He didn't like his prospects.

or

He didn't like where his life was heading.

or

He didn't like the way his future looked.

[RonBee]

For the second one, try:
.

He didn't like his life--not the life that was in front of him, but the life he was living presently.

Or, simply say:
.

He didn't like his life.

(It's the second and third sentences that are identical in meaning.)