By January of 1945, Germany was in an impossible position militarily. On the Eastern Front, a massive Soviet Army was coming ever closer to the German border, having retaken all of the territory lost earlier in the war, as well as most of Eastern Europe.
On the Western Front, Hitler's last gamble had just failed. He had launched an offensive through the Ardennes Mountains in December 1944 hoping to throw the Allies off balance enough to strike a peace deal. He used the last of his manpower reserves and his best panzer (tank) units, and failed miserably. Germany now faced an Allied army of 2 million soldiers and had very little to defend itself with.
The Luftwaffe, Germany's air force, was a shadow of its former self, and could do little to interfere with the massive B-17 bombing raids hitting German cities night after night. German U-Boats were suffering devastating losses in the Atlantic while an avalanche of men and war material made it safely to French and British ports.
Adolf Hitler himself, in poor health and suffering from tremors and hearing loss related to the assassination attempt against him the previous July, moved into his underground bunker in Berlin, and would not leave there until his death in April.
Germany's defeat didn't just seem inevitable, it clearly was inevitable. They were doomed by 1945, and probably earlier.