Here is a study that shows what you have probably suspected all along. Germans can't enjoy life. Now comes the scary part, this is not only limited to Germans. I see many high achieving individuals from all over the world that have a challenging time to cut loose and enjoy themselves. Read it and see if you see something familiar here. If there are many similarities you should be scared.
In any case while this is so exaggerated that it's funny to read there is some truth in here.