That's definitely a difficult transition, so what you're feeling is totally normal! I think developing a new routine is important, especially if you can start regularly going to a place where you can develop some of that community you had a in college- maybe a gym, fitness class, coffee shop, pub trivia, volunteering, or anything like that! Also, I think it's important to give yourself time to grieve the ending of that phase of your life. I grieved the ending of college for several months after graduating, it really is a time in your life that's unlike most things in terms of the safety, community, and ease of your life so it's okay to be sad about that ending.