Band you aren’t in the least pathetic for feeling upset.
Wanting kindness and approval from our parents isn’t pathetic, it’s normal
Think about your own children. Think about the kind of relationship you intend to have with them when they are adults. Do you think you’ll be saying the minds of things to them that your Mum says to you?
I’d guess that would be a fairly resounding “no”. 
So therefore the lack isn’t in you.
I’m not keen on the MN readiness to say “go NC”, I think you’d probably feel better about yourself and about your Mum if you could learn to manage her.
You aren’t pathetic. There’s nothing wrong with you. You do have to change how you deal with her though.
How do you deal with tantrums in toddlers? Kindness, firm boundaries and appropriate consequences.
You don’t argue with a tabtruming toddler do you? Of course not! You either:
Ignore the behaviour completely
Or
State expectations of behaviour, establish boundaries and deliver appropriate consequences.
Afterwards you give them a big hug, tell them you love them and remind them that xyz behaviour is unacceptable.
You never ever give in.
Tantrumming adults are exactly the same.
Establish boundaries and stick to them. Implement consequences as appropriate.
So “Mum I love you but I can’t have this behaviour in my house. Either calm down and behave yourself or take yourself off home and we’ll look forward to seeing you another day”.
Or:
“Mum, I love you but I can’t stay if you continue to talk to me this way. Can we have a nice visit or should I come back another day?”
Just like with a toddler you need to be clear on boundaries and not threaten anything you aren’t prepared to follow through with.
Just like with a toddler, it will take a few goes of implementing consequences before the message gets through.
Consequence doesn’t have to be you leaving btw, it could be you leaving the room for a little bit for example.
If she’s been behaving badly for years without challenge then it will be a bit of a shock for her at first.
She can do it though. I bet she doesn’t speak to her friends, colleagues, neighbours etc like she speaks to you, even if she disagrees with them. Why not? Because they wouldn’t accept it.