I always lose at endgames

You need to read a chess book on chess endings. One with all the endgames, and have to read it from cover to cover. Few have that discipline. I would recommend starting with the small one by Yuri Averbach:
You need to read a chess book on chess endings. One with all the endgames, and have to read it from cover to cover. Few have that discipline. I would recommend starting with the small one by Yuri Averbach: