Born in. I don't think I ever "made the truth my own" (well I did, just not "the truth"). I waited until I was 19 to get baptized because I was waiting until I felt a need to do it. I knew all the doctrine backwards and forwards but it still didn't feel right to me. If god wanted to kill me because things didn't sit right with me and I acted accordingly, then he was no god that I wanted to serve.
One of my biggest reservations was the rules around dating (it seemed stupid to make kids wait until they're dating with a view to marriage since I'd seen that lead to hasty marriages a number of times. Also, how do you ever really get to know someone if you have to be chaperoned all the time?) and the apparent lack of girls that had any ambition in life beyond getting married and maybe pioneering. Then I met one that was going to college and wanted to do something with herself beyond be in the cult. She barely ever talked about cult stuff, which was great for me. I fell hard and then she broke up with me (in hindsight, I think this may have had something to do with my father). One day, while I was emotionally distraught from the break-up, my father walked into my bedroom and started talking about her but didn't take long to get to his point - he asked me "Did she know you weren't baptized?" I said "It never came up so I assume she didn't" His response was "What do you think she would've thought if she knew?" And that was it - I thought this must be a message from god - he showed me that I could find love in the cult but took it away because I wasn't baptized. I'd never be happy unless I was baptized. So I went for it at the next convention. At that point I was stuck and just trying to make it work.