I'm sorry, but this is coming over as really entitled.
Do you know how difficult it is to get into Oxford for PPE? There will be many students (of any age) who would sell their granny to get such an offer, no matter what the college.
If you are at an "equally good" university, why don't you stay there? Better the devil you know, eh?
Yet this obviously wasn't "prestigious" enough either, was it, because instead of enjoying this university, you applied to Oxford.
You say that your decision is not based on prestige, but you are turning your nose up at what is an excellent college, with high standards and great students and tutors, because you would rather have a more famous, prettier and older college? This is not a great reason!!!
If it wasn't for Harris Manchester, you probably wouldn't be at Oxford at all. If you are borderline, and the other colleges are full, they may well refer you to Harris Manchester to give you another chance. For this reason this college is a lifeline for the over 21s.
I was looking into Harris Manchester for someone else. It is not as modern and more attractive than some colleges.
Look at this lovely May Ball youtube. It shows you that Harris Manchester can be as childlike as any college
https://www.youtube.com/watch?v=ytES3QZ1QooContrary to popular myth, Harris Manchester college is not stuffed with 40 year olds. It is far more likely to have other 21 year old people, or maybe some just a little older, who have been out in the real world, earning a living for the last couple of years. Doesn't this make them even more interesting?
It also has lovely little quirks, such as chapel services for pets
As for engaging with the wider university, my elder son was a member of the following Oxford University societies:
The History Society
The German Society
The Tea Drinkers Appreciation Society (secretary)
The Gilbert and Sullivan Society (secretary)
Port and Policy (a must if you are a PPEist)
Oxford Union Debates
He wrote for the Cherwell (Oxford student magazine)
Sometimes he used to turn up alone at French society cheese and wine dos (although he did not read French and knew no-one) and start singing. Once it was filmed and went viral, getting over 1,000 hits. My point is, if you really want to get involved with the university, you can.
He even knew Dobbo through port and policy!!!
Here is a list of all the glorious clubs and societies you can join:
https://www.ox.ac.uk/students/life/clubs/listNow come on, use your imagination!
This son became a BNOC (big name on campus ie one of the 10 most famous people at Oxford), despite having no connections or being particularly sociable before. We literally could not walk down the street in Oxford without him being hugged by someone. (Some of the huggers were even from Oxford Brookes - he knew everyone!)
So please do not make yourself look silly by asking the tutors to let you change college. If you are happy to extend the hand of friendship to other HM students, you will soon start seeing the college as family.
Let this be your mantra
https://www.youtube.com/watch?v=l3VqAsMXE7o