Tattoos

You're old enough fuck, marry, and drive a car, so do it.... better to regret the things you do than the things you didn't do.

You can always get it lasered-off if your faith or aesthetic taste change.

/2p

I'd also say do what you like,
but honestly, I would maybe have a chat with a couple of guys that had huge tattoos at that age beforehand,
like people you'd look up to, obviously, and hear their story about it.
It is kind of a big step, and lazer is expensive and hurts like shit I've been told..