Turnitin 25% similarity on my sociology term paper?

I just submitted my draft and got a 25% score, but I only quoted three sources in total. My TA said this is too high for a 1,500-word piece and I need to cut it down before the final deadline. I am a first-generation student and I honestly don't know if I need to rewrite entire paragraphs or just tweak the phrasing to lower the number.