It's safe to say that there's no facility in the "real world" where RNs write care plans as
detailed as the ones you're expected to produce in school -- but, in most places, we
do write care plans.
The point of writing care plans in school is that they are a
tool to help you learn to think about clients and their needs and how nursing can address them, and a tool for your instructor to be able to see how you are gathering and processing info about your client(s). It is a process that practicing RNs do, in an abbreviated form, in our heads.
Everyone struggles with them at first, but they'll get easier as you go. I can't swear to it, but I'm
guessing that you didn't have to do them in LPN school because "planning and directing care" is an RN role and not an LPN role (and I hasten to say that I mean no insult or disrespect to LPNs by that; just that it is a legal/administrative "scope of practice" issue -- RNs are responsible for "planning and directing care" in most jurisdictions, and LPNs aren't).
Hang in there!