I disagree about passability being 80 percent confidence. Physical body appearance cues matter a lot, in some people less, in some people more. People who don't have much in the way of physical cues hampering them tend to say it's a matter of confidence, just like I tend to say it's a matter of physical cues because I have problems with those.
Personally for me hormones didn't do much, started at age 34, been on them for 19 months. I'm hoping to get surgery for my nose and adam's apple to hopefully fix my passability issue.
But you have some good things going for you, such as starting at age 19, and I'm guessing that unlike me you're not bald and taking hormones will make it so that you probably won't go bald in the future either.
Sorry to be a party pooper, but not every trans person gets to attain passability, it's not either you're a woman in your mind, soul and heart or you're not... it's a lot more complicated and messy than that.