I was minor when my account was created, now I'm 18. My parents can see my account aswell as my activity. How do I get off their investment account?

Hi, new here but not to investing. My parents opened a youth account for me when I was a minor under their main account. I turned 18 and made it into a normal brokerage account, i haven't touched it because my parents are worried that they would have to pay taxes for my trades. They still can see my account under their investment account. I have a few questions

•Are my parents taxed for my trades?

•How do I unlink my account from theirs? (so they can no longer see my activity)

•Do i have to create a brand new account? If so, how?

Thank you I think i posted this right