I think nearly all people (and probably everyone in this forum) need some social contact - no matter how introverted, shy or grumpy we are
We just differ in the amount.
Although I did have same-sex friends when I was younger, that has dwindled as I have aged (I'm now 51) and now my only close friend is my SO. She's not my girlfriend, and we drive each other nuts if we spend too much time together but for where I'm at in my life, it seems to work reasonably well. I do have one or two other people I can talk to about problems and personal issues, but she is my main buddy and companion. We speak on the phone every day, and see each other once or twice a week. That is enough for me.
I've heard people say that having very few friends is a risky business, as if you lose the few relationships you have, you have little left. That's true, but the people who say things like that are usually extroverts (or reasonably sociable introverts), for whom socializing and making friends comes more easily, and is something they naturally want to do. Having more than a very, very small close social circle would put my circuits into overload, and probably trigger off some combination of social anxiety and old-retired-man-grumpiness
I'm just way happier with one close friend, and a fair amount of casual social interaction. Any more is too much for me. I'd rather risk losing the very few friends I have and have to go through a period of loneliness than suffer the excruciating tedium of having to cultivate more friends than I want or need. I am not by any means a misanthrope - I think people are fine. I'd just prefer, for the most part, to observe them from a distance.
I get to talk to lots of locals when I sit outside and feed the neighborhood cat every day.
I enjoy talking to my neighbors, and people in the places I shop at. I had a lovely chat and a laugh with the X-ray technician who X-rayed my back this afternoon. Yesterday, a great chat with the proprietor of my local bicycle store. When I'm done with my errands though, I like to go home, maybe talk to my SO on the phone, make dinner, and hang out with the cats. To some it might be dull, but this life is wonderful for me.
Sojourner - sorry I don't have any tips for you, but I think others have already contributed in that regard. You'll find your own level, I'm sure. Just give it time.