Cameron Kasky, a gun control activist and survivor of the 2018 mass shooting at Parkland, Fla.’s Marjory Stoneman Douglas High School, came out in a letter tweeted this week. Kasky emerged as one of the most prominent survivors of the massacre, which killed 17 of his classmates. Along with other students that included out Parkland survivor X Gonzalez, Kasky helped organize the 2018 March for Our Lives gun control rally in Washington, D.C.

In his tweet he said, “I don’t know what ‘type’ of queer I am, and I am finally okay with that. Bi? Maybe? I don’t know, man. The journey towards self-acceptance is one I have been on for years now, but the most difficult aspect has been searching for meaning in sexual identity when there truly is none. At least not for me. I’ve wanted to be straight for so long. A straight guy who’s done some gay stuff here and there. There’s so much security in heterosexuality.”

The activist also talked about the stigma of being bisexual or demisexual, the latter of which describes sexual attraction that only corresponds with emotional attachment. Kasky described being told by white gay men that bisexuality and demisexuality are illegitimate. “Bisexual men are told they’re just gay but afraid to admit it and bisexual women are told they’re just straight and having a little fun. We need this to change forever.”