I was OTD at one point, and found my way back.
The problem is what’s considered OTD. Different groups have different ideas about it.
Some chassidim think their kids who wear jeans and sneakers are OTD, even if they’re still keeping Shabbos, kosher, etc.
Some people think if a teen is talking to the opposite gender, even if they’re totally shomer negiah, is OTD.
In my case, I was really gone – didn’t keep Shabbos, kosher, or anything.