"I'm tired of feeling alone. I deserve to have the same rights as anybody does by having a child, a family," she said.
Earlier in her testimony, she requested to have the 13-year conservatorship first put in place amid concerns for her mental health formally ended without an evaluation.
"I truly believe this conservatorship is abusive," she said. "It's my wish and my dream for this to end."
Responding to Britney's heartbreaking revelations, passionate activist and former Charmed star Rose McGowan posted a video message to her 776,000 followers.
"This is a message for Britney Spears and any other human who is being controlled by greed and evil. Fight on Britney, we're with you, we hear you, we have heard you. I know the cost of control and you've been controlled since zero."
She went on: "Fight on, there is freedom on the other side. I pray this judge gives you your life back, and I'm brutally angry that is has to be that way, that someone has to rule for you to get your life back.
"Can you imagine what that's like, any of you out there? Of course she's angry. Righteous anger changes the world. Keep fighting, we're with you."
The powerful post was captioned: "A win for one woman is a win for all. A win for one human is a win for all. Let Freedom Ring! #FreeBritney"
A number of other celebrities including Brandy, Halsey and Mariah Carey have also sent the 39-year-old their well wishes as Britney's words dominate headlines.
Jamie Spears was granted control over his daughter's personal and business affairs in a court-ordered conservatorship in 2008 after the star was hospitalised amid concerns over her mental health.
For years there has been speculation about how Britney felt about the arrangement, with fans combing her unusual social media behaviour for clues.
In her court address today, Britney confirmed that behind closed doors all is not as it seems despite her bubbly facade on Instagram and constant assurances that she's "fine".
According to Variety, she told the court she was "in denial" when she shared posts over the past year saying that she was "the happiest she's ever been".
Another court hearing regarding the estate's accounting documents is set for July 14.