Some people seem to have the knack of forming intimate friendships very easily and very quickly. My DDiL is one such and she also manages to keep her friends from years gone by. I think it's because she puts a lot of effort into nurturing the relationships. I would find it exhausting and intrusive to do what she does.
I have no problem making aquaintances and enjoying contact with them at the various groups I have always been involved with but I do not want or need the intimacy which goes with close frindships. Over my lifetime, from childhood onwards I think I have had perhaps half a dozen close friends but dozens of aquaintances - many of whom I have been very fond of and have enjoyed lots of events and outings with. But many have them have been ships passing in the night and whilst I remember them with fondness, I have no regrets about the passage of time moving us both on. I enjoy solitude and quietness but do look forward to attending WI and my weekly choir and see and enjoy my lovely family lots, so I am not a loner per se.
I suppose I am trying to illustrate that it is perfectly possible to have a contented life without being involved in making close friendships. However the only way to do that, if that is what you want, is to join things and as the saying goes, "to make a friend, be a friend".