CNN  — 

YouTube star Jenna Mourey, known by her channel name Jenna Marbles, announced Thursday she is leaving the platform amid a controversy over racially offensive videos.

“I feel like we’re at a time where we are purging ourselves of anything and everything toxic,” she said in a video titled “A Message,” in which she apologized for racist and sexist content.

Mourey, who has more than 20 million subscribers, highlighted specific videos from 2011 and 2012 – one in which she donned blackface to impersonate rapper Nicki Minaj, another featuring a rap song with a joke about Asians, and one video in which she slammed women who “slept around.”

“It was not my intention to do blackface,” she said of the Minaj impersonation. “I do want to tell you how unbelievably sorry I am if I ever offended you by posting this video or by doing this impression, and that that was never my intention. It’s not okay. It’s shameful. It’s awful. I wish it wasn’t part of my past.”