So basically some scientists go to Antarctica but find a shape shifting alien but nobody knows who is real or not and in the end only two survive but they will probably die because they are stranded in Antarctica. Has anybody seen this movie and remembers the name of it?
Yes, as Tim already commented, it sounds a lot like The Thing (1982) with a group of scientists in Antarctica, a shape changing alien from another planet, and at the end only two are alive stranded in Antarctica without a base to keep them alive. Here's the IMDB page.
The Thing (1982) is based on the novella "Who Goes There?" (1938) by John W. Campbell.
It is sort of a remake of The Thing From Another World (1951), and there was a sort of a prequel called The Thing as well, made in 2011.