Helga, I've read this thread three times now, and I think it's the most honest one on the forum.
What surprised me about the loneliness in retirement is how it hit Sue and me differently. Sue found her people within months: a painting class, two neighbours, a Wednesday coffee that is now an institution. I found the house, the garden and the car. Men of my generation, I've come to realise, were never very good at making friends on purpose. At work it happened by accident, and nobody tells you that when work stops, the accident stops too.
What finally helped was a walking group of mostly retired men from four or five countries, who meet on Saturday mornings and argue about football and pensions in three languages. I nearly didn't go, because it sounded like the kind of thing I'd have mocked at fifty. Now it's the fixed point of my week. So, for the men reading this especially: the recurring thing Kwame mentioned applies to us too. We just have to swallow our pride and turn up.