The sooner you address your on-the-job loneliness, the faster you can redirect your underlying stress into positive energy. Here are two outreach strategies:

1. Reach out to others in your organization. As an experiment, have lunch with different sets of people at least once a week. Getting to know colleagues in other departments not only helps you develop new friendships, but also enables you to feel more connected to the organization as a whole.
2. By participating in rich, rewarding activities outside of work, you can gain a sense of belonging that you can carry over into your job. Spend at least one hour per week socializing in a group that shares an interest in something that you care about, such as volunteering with a nonprofit organization or joining a bicycling club.