I will speak to the loneliness...

Have you thought about investing in someone else's life? Perhaps you could volunteer at a retirement home, or at an animal shelter?
Perhaps making a small difference in someone's (or an animals) life will assist them and you at the same time. Like was said before, picking someone else up, will pick you up.

Or giving back to the community by helping those less fortunate?

Or even simply building a habit of daily visiting your local diner or coffee shop?
When you develop that habit (even if its just for coffee) you start developing a repore with the wait staff and any of the regulars that go.

Or perhaps find a small group of people who enjoy activities that you do. And if it's a weekly event, you will look forward to it!