Go to the library, it will be great. I saw on here once that making friends with others mothers is like dating. I actively pursued one I knew I would get on with!
Dont worry, this is what it is like for lots of us. I braved a NCT class at 5 mths, didnt like it at all and no one spoke to me (I didnt make an effort really). Like lots of others my job entailed speaking to everyone and anyone one but in my personal life I'm not the best with small talk.
I now have a fab little 14 mth old who keeps me entertained with her neverending learning and fabulousness and go to an NCT coffee morning on Mon, library Tue and a playgroup I volunteer at Friday. I know loads of mothers at all of them and now keep Wed and Thurs empty so I can organise play with people if I want or it just be me and dd. This only started when dd was 6 mths old and I realised that if I didnt make an effort then I would have no friends.
At the library, force yourself to chat to a few mums, ask what groups they go to and check those out too. You wont like them all but you will find a couple you do. Persistance is key.
Learning to drive would be really good for you if you live in the country and give you a sense of freedom to go where you want to.
I never did an NCT class as I couldnt get on one, and for a while all I heard was 'My NCT friends' I thought I'd never have any friends but you sound lovely, so dont worry you will.
Good luck. x