Volunteering is a very good idea bettyboo and joining groups which follow things you are truly interested in but are they going to make you the close, confiding friends you need?
I've never felt like you although I can perfectly understand it.
I have heaps of acquaintances but no real friends either but I am, by nature what you might call a sociable loner - I get on well with people but I don't get close, not close enough to confide my deepest fear anyway 
I have a busy life because I joined a group made up of people from a different culture to my own, even speaking a different language, and it's truly fascinating to learn about and appreciate the differences.
Outside our social meetings we have cultural duties such as funerals and attending official meetings.
But then, at the end of the day, I do what I have done all my life - I come home, close the door and breathe a sigh of relief that I'm alone.
I hope you find real, genuine friends in 2019.