16 years old was a weird time for me. it was the second time in my life I came out and being trans, and I have a huge memory gap right before the tail end of being 16. it's weird that I don't remember much of it anymore.
I think my biggest take away is that it hurts to let your perspectives change as you age, but you just have to let it happen if you want to grow. a lot of people you'll find in adulthood are stuck in mindsets and worldviews that form around their 20s, informed by things they vaguely remember as teens. not that there's anything wrong with it, just that I personally feel that the teenage years might be the most self aware time of your life, while simultaneously being carefree for some. life at 23 for me feels like constantly having to work backwards - why do I believe this? why do I have this bad habit? why am I struggling with this same thing over and over? I feel like you still struggle with that when you're 16, but in your 20s the layers on top of the problems begin to form. and you can't avoid them, nessecarily. it's just easier to figure out why you have certain habits and beliefs before time obscures them, even without the memory loss I have.
as you control your own life fully you find it harder to get out of more intricate ruts.
the reality is, that we don't know everything. 16 is a time in your life when people almost demand you start planning for your future. and there's nothing wrong with that, nessecarily. but nothing is future proof. we have to live with a grain of salt and not get too involved in things that hurt. that gets harder to do as you get older, get stuck repeating old patterns. but practicing introspection and curiousity in your late teens is a great way to keep that muscle up as you get older. because things will change - facts, ways of life, even your opportunities you have. it just pays to be humble but optimistic.
also everyone's lying being an adult is pretty cool. I might be biased but I love having autonomy and a life and being taken seriously and getting older. never thought I would have any of those things. taxes suck but it's once a year and we have TurboTax now who cares. working sucks the most but it's just like going to school. you plan life around that chunk of time. only as an adult it's super flexible what you want to do.
also things hurt more now than they used to already. I've started grandma-maxxing with cardigans and canes.