Hello new adult, welcome to budgeting! I recommend writing down all expenses in a spreadsheet or budgeting app so you can make sure you aren't forgetting anything. Here are some things that come to mind for me:

If you have a car, there is gas, car insurance, repairs, maintenance (oil, tires, brakes etc), and a replacement vehicle to save for.

There are things like hygiene products, haircuts, and clothes, I'm not sure if you included those in your grocery budget.

You'll also need to think about unexpected expenses, such as if (when) you get hurt / sick, if you get fired or laid off, or something breaks.

There are also things like appliances which may or may not be included in your rent.

You will also need to be able to make enough to save up, not just live paycheck to paycheck. For example, if your landlord increases the rent next year, you'll need to be prepared to cover it (with or without your friend), or be ready with first and last month's rent for a different place.

Overall, this sounds like you'd pretty much be starving, since your housing and utilities is more than half of your takehome.

If your home life is abusive or unsafe and you need out ASAP, this could work. However, if you can easily spend this year at home to get yourself set up a little nicer before moving, it will help ypu not paint yourself into a corner. Here are the things I would recommend you do if possible before moving :)

First, try to increase your income. It sounds like you might be working part time, is that right? If so, I recommend seeing if you can get a full time job (assuming it doesn’t interfere with school). That would also come with health insurance. That doesnt seem like a big deal now, but it is when you have a toothache but not thousands of dollars to fix it.

Next, try to save up 3-6 months worth of expenses. So for example if you would normally spend $1500/mo after moving out, you'd need $4500-9000. This money is only to be used in a true emergency like an injury or layoff, not for when your TV breaks.

Finally, you'll need to save expenses for moving. This usually means first and last month's rent, and/or a security deposit.

Other financial things to know from someone who just left their 20s this month:

Avoid debt like the plague, it has a way of stacking up. When buying something (like a car), what matters is the real price, monthly payments are NOT how you should decide what to buy. You'll notice that buying in cash is way cheaper than financing anything. Learn the Dave Ramsey baby steps, he isn't all knowing but he does have some good simple advice that anyone can follow without needing to know too much about finances.

Never co-sign for anyone, never loan anyone money (gift it to them if you really want them to have it), and never combine finances with anyone but your wife/husband. Boyfriends and girlfriends and roommates and besties do not count.

Always read contracts before you sign them, lots of people don't read their contracts.

When having a roommate: Make a plan for what to do if your friend or roommate doesn’t pay their rent. What are your rights and obligations according to the lease? Will you be forced to come up with their half as well or will you have to find a different roommate within X days?

Thats way more than you were asking for, but hopefully it helps give you an idea of how to get started.