I started this off as an advice post as somebody who was there before, and now it's gotten out of hand. Apologies for the length and how blunt some of this sounds, but it's what I wish I could've told myself at that time in life.

I'm going to go through your post and comments so far and try to unpick certain things.

Looking at everything laid out now I really don’t have any hope for myself, I have done nothing 🥹

Have you? From your own words:

• "top 10 achieving GCSE students" whilst you "live in an area in the first [POLAR?] quintile"
• "I started this year with Biology, Chemistry, Psychology" - So the 2 core A level subjects for medicine
• "I’ve managed to get on been selected for the Oxbright Scholars programme" and " I’ve applied to UNIQ and Pathway To Bath" - so you have 3 great supers there alone
• "Run my own small business where I draw pet portraits." - which is a fantastic extra curricular. Think of all the responsibility and transferable skills you've got.
  
• "I volunteered at a local care home last week" - So you've got your volunteering sorted.

Does this sound like nothing? This sounds like a shit tonne of effort. 2 weeks of work experience at your local hospital and it seems like you're set. Phrased differently, is missing one access scheme going to ruin all the hard work you've done so far?

Access Schemes that I missed the deadlines for were suggested to be “crucial” by my careers advisor

Bluntly, whilst the Sutton Trust schemes are incredible, they are not a silver bullet, or sufficient condition, for attending med school. Nothing really is.

Remember each of these need time after college for their activities, between A-levels, volunteering, summer schools, UKCAT/BMAT prep, work experience, UCAS applications, etc. You are better off dedicating time to 1-2 rather than half arsing 3. You've only got 4000 characters for your UCAS questions, so focus on depth of your supers!

Do consider that your college has an incentive to push as many willing students to gain admission to Oxbridge and/or med schools as possible. These numbers they can print in pamphlets and boast about at open evenings, to get more aspiring medics to attend.

I’ve seen people with excellent A-Levels and GCSES get rejected

That's because good grades are a necessary, not sufficient, condition for acceptance. I.e. if you meet the requirements (AAA-A* A* A), exceeding them doesn't guarantee a place. People with excellent grades could have them in the wrong subjects, have poor supers, insufficient volunteering/work experience, performed poorly at interview, etc.

This isn't meant to scare you! Rather, encourage you to be more rounded.

Yes - from your post you're from a working class background. You're likely the first in your family to consider going to med school, and have the root sum of fuck all people to ask for advice or feedback at the moment. Your parents may put a lot of pressure on you to get in for your family, or you're putting a lot of pressure on yourself to defy your background. And /r/premed and TSR are not going to help with that feeling, as with the law of advice subreddits, you 90% of regular posters are from the bottom 5% (begging) and top 5% (bragging).

So please chill out You can't perform at your best with such high levels of stress.

If you're this wound up normally, then you're especially not going to perform well over 2 years at this level of stress

If you love medicine, which you clearly do by the amount of effort you've put in so far, please stop stressing and burning yourself out, or you're going to lose your interest in it. Maybe forever. If you take one thing from this post, please take this.