Dr Byrnes got it!
Vounteering is a wonderful suggestion.
Once we are out of school, retired, or just not working, many of us get lonely because we are, in fact, alone. No one should be alone all the time. I suggest: joining a church, a community center, or even an aa or al-anon fellowship if appropriate. Volunteer at: a library, a soup kitchen, a volunteer ambulance, a shelter, you name it!