DO NOT WORRY. It is far too soon to do so and if you take worry out of the equation you will relax and enjoy your current situation more. Let your social life flow naturally- do not try hard. It takes time to meet the people you will spend most of your time with. You are being bombarded with new experiences. It takes time to settle into the rhythm of the college experience. Concentrate on the main reason you are where you are- the academics. People in your classes have similar interests. They, too, are figuring things out. “When the dust settles” , ie freshmen settle into routines, you and the others will discover each other.
You do not know 100% of anyone else’s life. You only see them busy and not alone like you. As others state, learn to value that down time. Remember to study. An easy way to flunk out is to feel you have to be on the go all of the time.
Dare to be yourself and like you. Rise above the crowd. Consider this- are others fighting loneliness with hyperactivity? So many things to think about. DO NOT OVERTHINK THIS.
Time is needed. Put your concerns out of your mind for the month of September and reexamine them in October.