Shy and quiet

[Summer1234567]

I am in my late 30's and have always been shy and quiet. I thought I would grow out of it but I've never changed.

I have a husband and two children, I have no friends, i have a job but no friends at work. I have no friends with school mums. I've tried really hard to make friends but because of the way I speak (so quietly) no one seems interested in speaking to me.
I've joined groups before but everyone already knows each other and I end up sitting on my own and coming home feeling sad. I try to be friendly and smile at everyone but feel I'm coming across the wrong way. I don't like the school run as I'm the only mum that stands on my own.

Lately I feel really lonely and isolated, I want to change and be a confident person but don't know how to change. Is there anyone with advice?