May 13, 2015 02:00 PM

Even stars like Brittany Snow aren’t immune to the bullying and self-image struggles that plague countless young people on the Internet.

“For many years when I was younger, I let negative things that people said about me affect my life,” Snow reveals in a video for #PostItForward, a new campaign launched by Tumblr encouraging young people to post videos about their experiences with adversities like bullying, mental health issues, sexual assault and self-harm. “What I’ve learned is that it’s really important to find the right support network, focus on the positive things in your life and quiet that negative voice in your head.”

Snow – who cofounded Love Is Louder, an anti-bullying project – has a message to those struggling with negative self-image or even a nasty Instagram comment: “Simply tell yourself: ‘Maybe that’s not true.'”

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Vice President Joe Biden, Elizabeth Banks, Jordin Sparks, Wendy Williams and N.Y.C.’s First Lady Chirlane McCray have also made videos in the hopes of inspiring others to do the same and keep the discussion going.

“Nobody is perfect. It’s okay to ask for help,” Pete Wentz says in his video. “Whether you’re dealing with bullying, mental health or self-image issues, know that there’s no shame in talking about what you’re going through.” Wentz invites participants to “own” the conversation and post their own videos, whether to offer advice, share art or work through personal struggles.

Watch Snow’s and Wentz’s videos below:

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