Feelings are transient and never discrete one time experiences. What you are feeling is completely normal. Transitions come with both the positive emotions you believe you should be having and the painful ones you were experiencing when you wrote your original post. Accepting that you have these feelings is a big first step. It is likely that if you can focus on the positives such as why you chose this school, why you want to study your major, etc that will help. Take actions to foster positive social functioning. Be patient but active. Read some of @bopper posts of lists of advice for academic and social success. You can do this. (Know that feelings come and go, my own daughter, a successful rising college junior, was on the phone with me today teary and expressing doubts, it’s okay, feelings are). Leaving home for the first time comes with progress toward adulthood but also loss of the childhood life that you have just left. You can’t go back. Even with your best of friends, it won’t be the same now that you’ve all left and gone to college.