At 68 you ain’t old mate, get out of the house and do things. Join a group, a club, exercise group, get a part time job, there are lots of others in exactly the same position as you, male and female.
You mentioned your life story, if you are going to recount how badly life has treated you - don’t, friends want to chat about nice things, holidays, hobbies, sports, family, even politics.
I’m 76 I remarried 2 yrs ago most of my circle gather at the local Rugby Club or a local pub. Friends are easy to make just smile and say a kind word