Please read this: http://talk.collegeconfidential.com/college-life/2016222-to-those-who-feel-lonely-homesick-friendless-think-they-chose-the-wrong-school-etc.html#latest
Start on page 1 and read the initial post.
I’ll add that I wrote the pinned post linked above after my D’s experience as a new freshman 3 years ago. To date, it’s been viewed by over 15,000 people, many of whom have contacted me to say how accurate it is. I swear your post could have been written by my daughter. There is no need to panic. College isn’t summer camp or high school. It takes time to build friendships. Give it time, it will happen.
Also agree with @gardenstategal . No one, despite what their Instagram says, is as fine as they appear to be. Maybe stay off social media for a few days, because it possibly makes you feel isolated.