YouTube performer Sam Collins has earned fans by making videos about his life as a teenage boy, but has just released a new video to his followers in which he has a big revelation: he’s transgender.

“I’m FTM,” he explains, “which means female to male. Which means I used to be female, I used to live as a female… I know this is going to be hard for some people to understand.”

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In the video, Sam lays out his history and the journey he went through before transitioning.

“I felt like I was trapped in my body. It’s a very confusing thing,” he admits, revealing that from ages 12 to 15 “I was just very, very depressed and very negative.”

Following the release of the video, Collins took to Twitter to express his appreciation for the “overwhelming” support he received.