If you would like to walk with a group for exercise or join an exercise class, ask about that. If you like to dance, do crafts, or play cards, ask about those things. Ask about transportation if you need it. Maybe you miss doing things for other people. If so, call your local hospital, library, church, or senior center and ask about volunteer opportunities.
Some people find having a pet provides companionship and eases loneliness.
Look for solutions and you'll find them. You'll also find other people in exactly the same situation as yourself. Living alone Living alone can be hard to adjust to if you have always had family around you. It may be that the time has come to move out of a house that has become too big and empty. If so, there are lots of senior communities that offer the privacy of your own apartment while providing dining facilities, group activities, and a built-in social life that you can join in as much or as little as you wish.