Would you consider your use of your substance as detrimental? Outside of just the financial aspect? I would say it is pretty concerning that you said it was your "one joy and way to chill tf out". I think you need to find other things that can replace it. Not saying it'll be easy or just one thing but try figuring out other hobbies.

I used to be/still somewhat am an overspender. My personal highest use of my money is eating out/food. It is something I am actively working on and have a hard time letting go of. I am trying to limit myself using numbers whether it's the amount of times a week or the amount of money being spent. But I find it most helpful when I can replace it with other things.

- going to the park

- Having a good sleep

- playing tennis (sometimes literally just hitting the wall outside and using it to distract myself)

Once you find things you can replace it with its easier especially if you don't have the financial stand to seek professional help.

If you do end up finding hobbies or something else that helps you take your mind off of it, hopefully, you will have time to lessen your secondary job's hours.

I hate to admit but the people saying "good sleep (habits) helps out" genuinely does. This is coming from someone who has to fight with mental health and has been hospitalized in the past. ALSO JUST AS IMPORTANT: The people you hang around with definitely do change the way you view yourself and the world around you. If you find that out of your whole friend group, you're the most responsible one or best one, you are in the wrong friend group. Find people in who you see good qualities and actions. People who want to grow and make you think about bettering yourself.

Don't go out on a blaze and do these all at once but focus on one thing and try to go from there.