"Fighter" is a song recorded by American singer Christina Aguilera for her fourth studio album, Stripped (2002). The song was written by Aguilera and Scott Storch, and produced by the latter. It was released by RCA Records as the third single from Stripped on March 13, 2003. Inspired by Guns N' Roses' song "November Rain", "Fighter" was characterized as a hybrid of rock and R&B that incorporates elements of arena rock and rock and roll. The track sees Aguilera thanking a man who had done wrong to her for making her a "fighter."

Answer this question based on the passage: who sings thanks for making me a fighter? Let's have some stream of consciousness first.
This is the relevant information: "Fighter" is a song recorded by American singer Christina Aguilera for her fourth studio album, Stripped (2002). So, the answer is American singer Christina Aguilera.