Hi there!
Sounds like a circular movement to me. I have my own personal history with loneliness. Are you afraid others might reject you? If so, why? Have you tried therapy? Why do you want to connect with others? Do you have things in your life that you want to share with others? Common interests?
A friend with a baby maybe isn't the perfect candidate for daily coffee dates, but people change, that doesn't mean that the connection is lost. It simply means we have to accept the change and maybe go through a little discomfort. I am sure there are people that are available if you let them in - what about your classmates? Have you tried talking about something that really moves you with them?