Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.

I have had a few friends who retired. They had to redefine many things in their life. Particularly finding new interests and ways to meet people.
I would suggest joining some meetup groups, taking a class, starting a new hobby, or volunteering.
If you have had deep seated issues w loneliness, perhaps contact a therapist to help you work thru those issues on attachment.
Sending you positive thoughts on this new chapter of your life!