Kyle Stephens, pausing to compose herself during Nassar's sentencing hearing in a courtroom in Lansing, Michigan, said the doctor, a family friend, began molesting her when she was 6 years old and her parents did not believe her when she told them.
"You convinced my parents that I was a liar," Stephens said.
"Little girls don't stay little forever," she added. "They grow into strong women that return to destroy your world."
Once her father realized she was telling the truth, he took his own life, Stephens said.
Stephens was the first of nearly 100 women who are expected to provide victim-impact statements during the four-day hearing.
Prosecutors are seeking a life sentence for the 54-year-old Nassar, who served as the USA Gymnastics physician through four Olympic Games.
Several victims gave emotional testimony on Tuesday and asked Ingham County Court Judge Rosemarie Aquilina to impose the maximum sentence.
Donna Markham, the mother of Chelsea Markham, testified her daughter was molested by Nassar after seeking treatment for a back injury she suffered in a fall off a balance beam when she was 10, Sports Illustrated reported.
Chelsea never recovered from the abuse and it led her to a life of drugs, culminating with her in suicide in 2009 at age 23, the mother said according to the magazine.
Outside the courtroom, Markham told reporters she felt compelled to speak for her daughter.
"I wanted him (Nassar)to hear what happened to my daughter ... the fact that he started the process of her self-destruction," according to video posted on the Lansing State Journal website.
Nassar is already serving a 60-year-sentence after pleading guilty in July in federal court to child pornography charges.
Attired in blue prison garb, Nassar sat with his head down on Tuesday and did not appear to make eye contact with the victims when they addressed him directly. At one point, he took off his eyeglasses and dabbed his eyes with a tissue.
At a November hearing when he pleaded guilty to multiple counts of sexual assault, Nassar apologised for his crimes, the Lansing State Journal reported.
Nassar was the team physician for the Michigan State University gymnastics and women's crew teams, as well as an associate professor at MSU's College of Osteopathic Medicine.
Olympic gold medallists Aly Raisman, Gabby Douglas and McKayla Maroney have gone public in recent months, saying they were assaulted by Nassar while undergoing treatment.
On Monday, four-time Olympic gold medallist Simone Biles said on her Twitter account that she, too, was abused by Nassar. An attorney for Nassar, Matt Newburg, declined on Monday to comment on Biles' accusations.
Raisman tweeted Monday she will not attend the sentencing because it was "too traumatic," but a letter she wrote will be read in court.
Biles and Raisman are among a number of victims who accuse USA Gymnastics and Michigan State of not properly vetting Nassar.
Both organizations previously said they were unaware of Nassar's crimes. In March, USA Gymnastics president Steve Penny resigned amid criticism of the organisation's handling of the scandal.
(Additional reporting and writing by Keith Coffman in Denver; Editing by Leslie Adler)
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