As an Aspie with similar issues to loud/busy environments I feel your pain!
However you're running into things that are going to be pretty common in your career and are difficult to accommodate "reasonably" for you:
Radio constantly on
This is something you could probably get the company to do something about - the radio isn't really a work thing, but it's probably unwise to ask for it be removed if others like it. Because there's bound to be someone who really likes having it on, and to them you'd be a party pooper. It's not fair, it's not right, but you'll end up being disliked for it anyway.
colleagues constantly talking to each other
That's the norm - and even if not all the conversations are strictly work-related there's going to be a size-able portion that are.
people in online meetings NOT GOING TO A MEETING ROOM.
This one at least is partially a feature of the pandemic - and should ease as the pandemic does, but in the meantime it's a work process, and one that's being done for a pretty compelling reason.
This made my progress extremely slow. I simply cannot function in loud environments.
Today I snapped and went to another room, but that is not a long term solution. But I don't think I can ask them to turn the radio off, since I am the only one who is bothered by it. The same goes for meetings being held in the same place as people trying to get work done.
Oh, I'm with you - I've plotted many immensely satisfying ways the radio in the office I'm currently working at could be obliterated from existence (not that I'd ever do it of course or recommend that anyone did!)
The upshot is though that there's not much in the way of reasonable accommodations the company can do to make a meaningful difference to the environment itself for you, the majority of it comes from the just the day-to-day of an office operating. But that doesn't mean there's nothing you can do!
Remote/Hybrid working - getting you able to spend all or some of your time working from would be a big win, it's not a particularly difficult accommodation for many jobs these days, particularly since the COVID-19 pandemic lead to many companies working out ways employees could work from home even if it wasn't something they did before.
If you can't be fully remote though there's still going to be the issue of how you make working in that environment tolerable for you and probably the single best thing you could do would be a decent pair of noise-cancelling headphones (and I mean decent - cheap crap won't cut it, I've tried). I'm currently sat at the office with my Sony MDR-1000X on - no music playing just the ANC doing it's thing and reducing the office noise to a distant background: The inanity of whatever Radio 2 is wittering on about is no longer plaguing me, the two or three people on different phone calls might as well be in another room. If I actually listen to some music it's like I'm alone!
If you can't afford a decent pair you might be able to ask the company to contribute as an accommodation for you - however purchasing your own pair if you are able brings the size-able advantage of them being clearly yours to take with you when the time comes to move on, because I can pretty much guarantee that this will be a problem for you at other work places in the future. You can keep things like remote working high on your want list for future roles but it's not going to always be possible and it's not fair on you to have to always avoid office environments.