After spending 5 years on a high school team, I went to college in a place where there was no team within the state at the time. (South Dakota--I believe they've added a team or two since.)
I volunteered at events, if I could get to them (particularly over spring break...). And I stayed active on CD. I'm now back into FIRST, as a mentor (and a glutton for punishment, as I volunteered to both ref and inspect at two events...)
You'll survive.
Oh! Almost forgot--Find out if your college has any engineering competition teams that allow freshmen to join. You won't miss FIRST nearly as much once you get into all-school-year design competitions

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Past teams:
2003-2007: FRC0330 BeachBots
2008: FRC1135 Shmoebotics
2012: FRC4046 Schroedinger's Dragons
"Rockets are tricky..."--Elon Musk
