My freshman year I did nothing outside of school except work retail (which I did as much as I could throughout school).
My sophomore year I became an RA and was shocked to find out how many organizations the other RAs were involved in (it was a lot). I joined residence hall council, too.
P1 I was a Head RA, in residence hall council, joined the school newspaper and Phi Lambda Sigma.
P2 I dropped residence hall council, but became my class' Student Government Rep and joined Rho Chi.
P3 I stopped being class rep and Head RA, but was elected Student Governemt Executive Secretary and got a second job at the VA.
Involvement can be overwhelming. I would have burned out and/or dropped out if I did all my P3 extracurriculars when I was a freshman. Just do everything gradually and see what works for you. Pick one thing and make a small commitment. When I started at the newspaper, I told them that I hated writing, but I owned a decent camera and would show up to photograph any event they emailed me about as long as I wasn't working. I ended up doing more, but I didn't over-commit to begin with. That snowballed into a hectic resume in the end, but was surprisingly manageable.