I could have written your post OP, in fact I've been trying to put something together for ages but bottling out at the last minute because I'm embarrassed.
I moved from my home town in my mid twenties when I met my DH and decided to move in with him in his home town. I had s fabulous best friend, and a wide extended network of friends who were women I knew from school, friends of friends, close work colleagues who I socialised a lot with and considered good friends. All melted away when I moved, except for my closest friend who I keep in touch with but it has never been the same because of distance and having kids etc.
I tried to make new friends but it's never really happened and for the past couple of years I've wondered if other people find me weird. I don't think I am, but I've no idea how other people see me. I've made friends in the past but have been trampled on and 'dropped' eg the friend I was really close to who we took in for a couple of months after she left her DH, she then found another partner and I saw her once after she moved in with him - she just totally cut me out and I was so hurt, DH was livid.
I find that anyone I meet already has well established friendship groups, and whilst people will be nice to me and friendly I am never 'included' as it never occurs to anyone to do that
.
I've tried evening classes, volunteering (governor, Cubs, kids football club, charity), hobbies, gym etc.
On the other hand, I was recently asked to join a group from work for lunch and a few drinks and I couldn't go as I was terrified they would find me boring and I'd never get asked again so I pretended I didn't have a babysitter 
I can't figure out whether I want the friendship circle or whether I'm now too scared and maybe need counselling to help me 