I was never 24/7 during college, that started after for me, but I will tell you this, just thinking about my college life... diapers would've been in the way the entire time, at least outside of class. They might of been nice during classes.
If you are a Freshmen living on campus, I will tell you this, you have next to no privacy in most Freshmen dorms. communal showers (they all have stalls, but that is where the privacy ends) your room mate, the best way to not feel like you live in a closet is to leave your door open. You have next to no storage, so hiding a stash of diapers to keep you 24/7 from your room mate is not going to be possible, especially with the extras required. You will not have your own bathroom, not in a freshmen dorm.
My advice, survive your freshmen year, apply for an apartment for your next year, and then reconsider it.
Also, take this from someone who is 24/7... if you are doing it for the jollies, 24/7 is not the path. If you are doing it because you feel "right" wearing, then understand that this is a hard hard thing to do. Every activity you ever do, you will have to consider how long, what clothing will be appropriate, how do I transport changing stuff, etc... It is a butt ton of work, and it is not more convenient, despite popular fantasy. You're going to be forced to tell certain people, well at I least I believe you should, because it will be better for them to find out from you instead of by accident, and trust me,close friends, anyone living with you, etc... WILL find out.