As far as I know, you are able to OC in Kansas at 18, the only age restrictions on adults are on purchase of a firearm and obtaining CCW. Without CCW you can't have the firearm on your person in vehicle if you are the driver, or within reach of the driver (though you can have it in a gun rack which leaves it in reach of the driver, so go figure), but can conceal it in the glove box or leave it in the open. You are a student so the biggest thing for you is that you cannot have a weapon on any school property within the state of Kansas without a CCW, and even then you must remain in the parking lot within a vehicle and be a parent or guardian of a student that attends said school...or a 21 year old student with a CCW. Also you can't carry anywhere it is lawfully posted or on government grounds, which there are a lot of in Topeka (Governor's mansion and office, DMV, etc.).
I'm sure someone will correct anything I misstated, but no one had responded so far.