I'm in the same boat as you, you're not alone!
You have plenty of options ahead of you, and if you're not sure, explore those passions during this year and see where it takes you!
There's no harm in applying for uni and waiting on this exciting job offer- so long as it does not overwhelm you applying for a job and uni both. But getting a job/the work experience will look great on, not only your CV, but also to uni's you're potentially considering.
I would stress though really thinking about how you'll feel living on your own if you're planning to live away from home. Do you get homesick? How do you think you will cope with your Mental Health? Is definitely something to consider. Ring up University's and see what support systems they have in place for students such as yourself.
I hope things get easier regarding your mental health, this is such a big change to your life- so don't be too hard on yourself! Take things a day at a time, and remember, this is your life. There is no rush to do anything!
Wishing you all the best for your future.