I move into college in 10 days and everyone just received their roommate info yesterday. I didn’t request anyone but everyone on the Facebook page is freaking out because they didn’t get matched with who they requested. I messaged my roommate last night, and it shows that she has seen it, so I’m assuming she just blatantly ignored me. I can’t imagine it being any other reason than maybe she requested a different girl but ended up with me. It really sucks because I’m anxious enough as it is and I have a feeling she’s already going to hate me when we move in…
Expecting a quick turnaround from someone you never met is unreasonable. Calm down. You will meet her in 10 days.
I understand how you must feel. Being ignored is not fun, but try not to freak out. There are thousands of reasons why she’s not ready to respond. Give her some time. You have a whole year to get to know each other.
I know it’s hard, but eventually you learn how to be patient when you send messages like that. My rule is generally that you should ideally wait 3-4 days before worrying.
OP, you mention anxiety. Your anxiety is making up reasons in your head for why the girls did not respond right away. As mentioned above, there are dozens of reasons why they might not have answered right away. Give it time. It’s not “ignoring” you when it’s been less than 24 hours, and there is no reason on earth she would “hate” you. I know this is a stressful time for rising freshmen-we just dropped our D off last week-but try not to let your anxiety get the best of you. If you’re in therapy, this might be a good time for one last appointment before you head off to school, and hopefully you’ve lined up a plan for dealing with your anxiety once there. Good luck-I’ll bet everything will be fine!
Since she doesn’t know you, don’t take it personally. There may be reasons why she hasn’t responded yet but it has nothing to do with you because, after all, she hasn’t met you yet and doesn’t know you, right? 
She might not be on social media much. Perhaps she will respond soon.
Don’t look into it too much. I know - you’re worried that she hates you because she wanted to be with someone else, you’re worried that she’s already busy trying to get a roommate switch, etc.
But, in reality, she’s probably just as nervous as you are and is maybe taking her time thinking out her reply to you. Or maybe she’s on vacation and doesn’t have time to respond, or maybe something else is going on that makes this matter something she wants to get back to later.
Give it some time. It won’t be as bad as you think it is!
Gah! Don’t assume the worst! It could also be that she in on vacation, she is working, she is camping. etc etc.
Also don’t go into it assuming your roommate will be your BFF…if they are, great. You should aim for having a pleasant relationship with the person you live with.
Set roommate expectations early.
She might be like my older daughter, who preferred not to talk her summer camp roommates until they met face to face. Her opinion was it was too easy to say the wrong thing and cause more anxiety before the move in date. She’s the type that generally gets along with her roommates, but isn’t buddy-buddy with them.
Neither of my daughter’s roommates responded to her until the week of move in. Then they shared what each would bring. Turns out, they didn’t like to “facebook” and one was extremely shy.
You can’t start school by freaking out that a complete stranger hasn’t bff’d you yet.
Please remember that she is just there to live with you; she’s not there to take care of you. Please don’t place these kinds of expectations on any future roommates.
I understand how you feel. I emailed my roommates and they didn’t reply. We moved in on Sunday and we only spoke once since then.
If your roommate was me:
Sees message.
“Oh, my roommate messaged me. I should reply to that or something. LOOK! That’s a hilarious meme! Hahaha. Wow, I’m really tired.”
Goes to bed and then forgets all about message until at least 48 hours later.
As everyone else has pointed out, there are many reasons for a delayed response. Besides that, even if your roommate requested someone else, that doesn’t mean she’ll hate you. Be disappointed? Yes, probably. But that doesn’t equate to her hating you. Give it some more time, and be lenient on her - you never know why it is that people don’t respond.
Look back on your life at the things that you worried about. For example, do you remember when you were going into middle school, and your big worry was that you would forget your locker combination? How did that work out? Roommates are the same thing. Everyone worries about their freshman roommate. The reality is… you will survive. EXPECT that you will respect each other (e.g. clothes and dishes, etc. not littering your side of the room; BF not sleeping over without permission, etc). EXPECT that you will not be BFFs. Most people do NOT want to be BFFs with their roommate. Think of a subway or an elevator - the closer you stand, the less you talk. Same way. You have to be in the same room, so you need to create distance. Our DD had several random roommates due to various college situations. Some were just fine, and if they happened to be hungry at the same time, they would go and eat together or hang out. Some were non-ideal for a variety of reasons (one was a bigot, one drank a lot and came home drunk regularly in the middle of the night). Some were sloppy, and some were uncomfortably neat. Guess what. She had a decent relationship with all of them, because she was respectful, gently direct when needed, and modified her behavior somewhat based on their requests and idiosyncrasies. As long as you expect respect, distance,and neutrality, you will be fine. If you expect friendship, percentage-wise you will be disappointed. If you were to ask her, she enjoyed living with her best friends, but the times when she was living with a random roommate were fine as well. Turn the investment waaaaaaay down.