we must have learned different histories then?
I guess we did.
At the Nuremberg trials, chief of the Operations Staff of the Oberkommando der Wehrmacht - Generaloberst Alfred Jodl - said that he doubted whether German casualties due to partisans in the Soviet Union were as high as 50,000.
Studies in the 1970s suggested a figure between 15,000 and 20,000 for German casualties. Source for this is: "The Phantom War" by Matthew Cooper p.ix
In other sources, the total losses of the Wehrmacht are claimed to be as low as 7,000 for the entirety of the war.
Link: avalon.law.yale.edu/imt/01-07-46.asp
Soviet historians had an incentive to exaggerate the role of the partisans, and the Germans had the same reasons too (as you say, it makes losing against the Red Army a little less embarrassing). In reality, they had little support from civilians, and were much more successful at inflicting casualties amongst our own population (through confiscating food and horses and executing so called collaborationists), than they were at creating problems for the Germans. P!ssed-off Germans would also typically torch entire villages as retribution for partisan attacks. In the end, the war would be won with or without them. Perhaps a little unromantic, but it's the truth.