Whatever life you envisioned for yourself, your 20s are when you find out if it’s viable—or what you really want. Money and time matter way more (in my experience), and your friends live further away. You get to do whatever you want, which is amazing and awful.
Expect to hear about peers working their dream jobs while living in inhumane conditions, discovering lifelong passions and quitting their ambitions, and re-making all the choices that seemed permanent at the time. Maybe by 35-40 you can expect consistency, but in the next twenty years your peers will go through a lot and change even more.
Just remember that only having a kid and back issues are forever. When in doubt, find a mentor or a role model. Focus on the present if you can, and journal if you can find the time—it helps.
Leaving you w/ this pic of sand—a symbol of the passage of time which is most beautiful when observed closely.