I also dislike the term 'widow'. I was OH's wife and always will be. I do wish society as a whole wasn't so keen to label everyone according to age, marital status, ethnicity etc. We're all humans with our mixture of needs and emotions and that's what's important.
Whiff, my heart goes out to you. Like all of us here, I understand the raw emptiness of knowing the one person who knew you, who encouraged you, who "got" you and was always there for you is gone. For me, some of the worst moments are when I wake from a dream about him and realise that it was a dream and I must face another day alone.
As Luckygirl said, there is no longer a 'your person' and it does feel frightening at times, as though a physical part of you is missing even though the mirror says all your components are there. It used to be that, if we went out together, we'd come home and chat about our shared experience. If I went out alone, I'd come home and share thoughts about what I'd done, where I'd been and the quirky things that made me smile (or grind my teeth). Now, I tell the cat or maybe phone my daughter but it's not the same.
If friends invite me to join them, I've never, so far, felt it's been a pity thing. I enjoy their company, the things we do together but the real loneliness sets in when there's nobody at home to smile with about the day.
I will survive; I will live the years I have left as well as I can; I will strive to find contentment - but, Hell's teeth, it's hard at times.