Oh sweetheart, you sound so angry and so sad and so exhausted. I really feel for you - grieving your optimism and your hope. It's so so hard when you feel so worn out.
There is some chance you will work at Walmart for some time but it is not definite.
Things change and they've been so absolutely shit for a while now that they have to soon. I can't tell if you already work full-time or not but having a stable wage makes life much easier. There is a silver lining.
Game dev is not simple to get into. This doesn't mean you'll never develop games, I promise.
Having to accept the nature of being working class and having to work forever is really painful and it's okay to find it really painful and why wouldn't you. It is complete bullshit. It is easier when you have a job you don't hate though or at least get to feel like you're expressing your values through.
I'm here for advice if you want practical advice but I think what you need right now is just mainly sympathy.
It is really hard, anyone would find it sad, and is extremely scary to find suicide an attractive option. I'm so sorry you feel so scared at the moment. What you need is to just get through the day at the moment.
Don't focus too much on the future, just focus on looking after yourself. It won't fix everything but it will get you through the bad days until you can problem solve again. Eating, washing, clean clothes, fresh air, getting some rest (ideally sleep but if you can't sleep, dark room, stay warm, nature sounds, that kind of thing).
Sometimes you have to go through waves of these feelings so just try and hunker down and get through it. Our brains suggest lots of ideas to try and problem solve in difficult scenarios and sometimes they suggest really bad ones which can be really scary. Sometimes you have to just kind of be like " okay brain, I know that's what you think is a good idea right now but we're just going to do something else for a bit". And then you get the control back.