I was much better back in college too. Looking back now I honestly have no idea how I had such thick skin. Do you know why your anxiety creeped in or was it just out of nowhere? The main thing with anxiety is that if you know and truly understand the cause of it then most (if not all) of it will go away. With the trouble you had fitting in with people I completely get that. You should try working with people who don't have a sense of humour and are a completely different age demographic to you

aka pretty similar to what you went through. This didn't do too well for my brain since it also made me feel completely alone and like someone 'other' My anxiety always made me think that people were talking behind my back since I would leave the room to go 'toilet' since I never connected with them and found it painfully awkward to try engaging in conversation with them.
To find people more like yourself I'd suggest you to join clubs your interested in and meeting people through there. Since you already have a common interest it should be easier to make conversation with them.I know how annoying it can be to try talking to people when your dealing with anxious feelings and the symptoms that come with it but you have to try and calm yourself. A bit of a tangent but I myself am quite nervous for when I go to university as I'm a weird, funky-ass dude (currently in a gap year to get money so we're the same age) and I worry I won't meet any weirdos like myself. Realistically you're bound to meet someone you click with eventually.
For my anxiety I've started to meditate: always thought it was a bit odd and not for me but damn it can do you some good. I've also started taking Lions Mane mushrooms and CBD oil to manage but I'm trying to ween myself off the CBD since I don't want to hve to constantly use it to feel okay. I want to fix myself rather than mask my symptoms. This might do you some good though to essentially set the foundation for your recovery. Think of it like this, if thing are bad right now the only way is up. You'll get better and better up until the point your anxiety won't even affect you anymore and you wouldv'e grown to become a stronger person because of it
I can't swiftly move onto different topics so I'll have to do this a bit abruptly but I struggled at A-level with my chemistry. I mean I genuinely sucked ass at it and ususally got low B's in the past papers. Ended up with a B overall. To improve, you have to identify what went wrong and focus on those area. It's normal to sometimes feel not as smart as others, that's fine. It's just that we have to put in particularly more effort than others may have to. Committment is down to the individual so if your passionate about your subject that's probably the only fuel in your metaphorical hearth you need to maintain you. If this isn't the case then think of your long-term goals and focus on them.
SFE should be able to give you financial support as anxiety is considered a disability that'd be covered under the mental health branch. All you need to do is ask your doctor for evidence e.g. evidence or consultations. They might need to write/print a report, i can't really remember since i only looked over it briefly.
One big takeaway from this is that you have to maintain a positive perspective on everything. Optimism is crucial otherwise your progress to recovery will be hindered dramatically. You have the right mindset, once this is over you have a fresh start. Part of anxiety can sometimes be fixating on the fact that you have anxiety. Accepting it as a part of you for the time being and being able to treat it gently as if it's kind of a joke helps to deal with it. I want to suggest something else but we need privacy. If you can, learn about PGP encryption and send me a message, also download Wickr. I'll message you my Public key or sth.
The Turkey thing really did make me insecure but now I find it kinda funny at how small I am. I've gone back to not caring about my height much apart from times where my brain goes funny and I can feel how small I am (like I'm actually 5'8 but then I got transported to a dream where I'm far smaller). That's sort of rare. I can feel my insecurities fading now but my main issue is the physical discomfort I feel due to my anxiety. The constant weak squeezing feeling. I don't really get emotional anxiety unless I'm about to go to work soon. I think it's just my personality honestly, I engage in quite a lot of self-deprecating humour but it's all in light fun so I like the fact that I'm not particularly tall or good looking. I care less about my appearence and put more focus in my personality making me more fun to be around.
I never even asked but could you give a general display of your personality and interests (I know your into fashion which is cool, so am I but more so into looking stylish without haveing to spend much so I dont get any designer)