Hi,
Congratulations on your pregnancy. Sorry that you're feeling so anxious about the birth. As others have suggested, Calmbirth classes are fantastic. I remember being in an induced labour with DS1 and thinking 'thank God, I did those classes', it was so helpful. As much as people say 'it's just a day in your life' (and it is) I think maybe you could ask your psychologist for specific help to work on this anxiety. Maybe even try some hypnosis? Maybe your mum's comments when you were young have influenced your thinking and hopefully your counsellor can help you to challenge these thoughts and alter them before your baby is due.
An analogy that helps me is it can be like preparing to move overseas and being anxious and worried about how things are going to pan out and as soon as you're on the plane, it's not so scary. My first labour was like that - wondering how I was going to cope and what it was going to feel like and then when you're in the moment, you don't have time to feel anxious as you're too busy/in the thick of it all. So maybe this is the hardest time for you, right now, waiting and anticipating and fearing the unknown?
Anyway, enough of my rambling, I hope you get some great support over the next few months and have a much better birth experience than you're thinking at this moment. All the best!