I’m so sorry you’re going through this OP. I also have 3 kids and have been through dark times trying to do it all and combining career and family.
It is very hard work so no wonder you're feeling the way you are.
I have a ton of questions for you, you don't need to answer them on here but I think they will give you clarity. Your mind seems to be tangled and I'm sending you such a massive hug. please be kind to yourself.
So here goes, ready?
Could it be normal to be exhausted by 4pm with all those worries swirling around, 3 young kids (including the mental load) and a household to run?
Have you got a cleaning, cooking, everything on schedule?
Could you schedule in a break for you so that you get some gas in the tank from time to time?
Are you planning your time properly, do you have buffers scheduled in for example?
Are you comparing yourself unfavourably to other parents? Why?
Could you find one or two friendly faces on the school run that you could make eye contact with and maybe even smile at them?
How do you know the other mums think you’’re weird and cold’?
Would it be a good thing to be like the other mums?
What is it that makes the 'all the other mums' different to you?
What makes you think you’re not likeable?
What was your business?
What went well there?
How can you protect yourself from breakdown that isn’t an all-in all-out reaction?
Can you find more of a balance? Are you often thinking in terms of of all or nothing?
Could you do a part time study course?
Could your kids help out?
Could your husband help out?
How is he feeling in all this?
How is your relationship?
What made having an Etsy shop so hard?
How can you reduce distractions?
How can you tackle your task list?
Can you rank your tasks and drop the unimportant ones? Delegate others?
Can you lower your standards in some ways?
Are you sure it’s your work history that stops you from getting a TA job?
Are there ways into that job?
Is your inner voice and the things you tell yourself about yourself mean and harsh?
How can you find self-compassion?
Can you be kinder to yourself?
Are you future tripping when you tell yourself you have no idea how you could cope with a job and 3 kids and household?
I could go on but that’s a start.
I’m sending you a massive hug. It is hard and listen, you are not damaging your kids. If anything you're damaging your self that is in there and needs a lot of love right now.
I believe in you. We all do.