You're prob not going to chat to me again anyway so I may as well say what I like (I've had a drink so this may not come out as well as I'd like)
I think you are in denial, you are either depressed or on the verge of being depressed. You are defensive, you think no-one understands, no-one has ever been there, no-one has lived your life, no-one understands what it's like to be a single mum with a bastard of an ex. Well we do, we've been there, we've come out the other side and are stronger and happier for it, we want to help others who are having a shit time because as women who care that's what we do, you can choose to throw it back in our faces but it won't stop us trying to help.
You don't have to talk to me you don't have to see a counsellor or your gp, you don't even have to change your life or meet more people. You don't have to listen to people on this thread or get more confidence.
You do have to do what makes you happy though, It's all any of us wants.
When you think about what you want for your kids, I bet your top priority is for them to be happy right? So do you think your mum wants you to be happy? I know you are close to your mum, why don't you talk to her if you can't talk to anyone else?