Ok, I'm guessing what you want is a partner.
To be honest I'd forget about that for now - what you need to do is make connections with people and cultivate friendships buy you have to make the effort.
All my friends are married with children, sometimes I get left out of very couply things, but I've never shied away from getting involved with their kids. Before I adopted my son, I was the mad, eccentric aunty/fairy godmother - I'm not really that eccentric, its just that my life seemed that way compared to school runs and holidays at Butlins whilst I was jetting off on safaris, so I always had a tale to tell - even if it was half made up.
The point is I worked hard to maintain my friendships with my friends when their children were little, now their kids are grown up, the friendships are still there.
I don't anticipate meeting a partner, one day my son will leave home. I won't have a lonely miserable retirement because I have interests and I will pursue them, as I do know. And on the way I will make connections and sometimes they become friends. The person I used to chat casually with in the sauna at the gym has become a friend because I asked her if she woukd like to go for a coffee, the women I met on a short course 5 years ago are now firm friends - we go out for breakfast or lunch most weeks, we are going to see Sarah Millican next week, we will do Christmas lunch and secret Santa, we go to the theatre together, or to gigs, the occasional rugby match. All of these women are married, it doesn't matter to them - in fact I think at least two of them are a bit envious of my freedom.
A couple of years ago I got an allotment, when I retire I will probably volunteeer for the committee, and the local library and help organise the local arts festival. I won't be stuck for things to do. The thing about volunteering is not just the volunteering itself, its that you make connections and friendships grow and who knows where that will take you.