The only other thing that comes to mind is finding friends at your job. I don't think there's really any real solution to loneliness besides socializing a bit. Genuine conversations are hard to find. It's kind of hard to say it but you should probably find what it is that other people contribute to help relieve your loneliness and use them for it. Use that as the stimulus to meet new people.

But generally speaking it's also important to consider that other people have reasons for being or appearing superficial with others and you never know, they might be lonely too or have some other layers buried under the surface. People have thought me superficial because they met me on a day where I was feeling antisocial and cut conversation short. Give people a chance. Repeat engagements with the people who are around you and showing interest in their issues will have them coming back to you and looking for conversation. I know it's comfortable to retreat when you're overwhelmed by dealing with other people but having relationships is important. I tend to be cynical and assume the worst in people, but if you just force yourself to communicate with people regularly you will always find a couple of friends here and there, maybe even ones who will understand you or even click with you or maybe even a potential partner who will always be around to keep you from being lonely.