You need to learn to be ok with being alone. You are the only person you will ever have the full right and responsibility to change. And during that change, you will have lonely chapters. This happens because you don't fit in with your old friend group because you're different than them, but you're not different enough to be in the group you want to be in. Embrace the lonely chapter, be patient, and know it's part of the process of getting where you want to be.