I'm feeling lonely :(?

It's sad about your girlfriend, but unfortunately no single person can make you feel connected or lonely. It's a lot to ask of a single person. The truth is that life is a series of distractions, one after another. School, jobs, and hobbies all serve as distractions that keep us from feeling isolated, things that keep us from asking questions about the reason for existence. What you need to do, then, is to distract yourself by finding new hobbies, making new friends, volunteering or even getting a part-time job. In the end, it's really boredom and loneliness that drive people to do things. If no one felt bored or disconnected, no one would be in relationships. Good luck!

I think you would be wise talking to a psychologist. If your friends and girlfriend cannot make the loneliness go away, professional help would be in order.

Take a class or get involved in church activities and meet new people. You can try to seek a support group for lonely people in your area.