So you pay 9K a year if you drop out now that means you owe 18k with nothing to show for it.
Also the thing a lot of people don't realise is that Bachelors degrees are not "taught courses". They are directed self learning which is why you have the phrase that somebody is "reading for a degree".
The whole point is that you are paying to use all the universities resources such as the library, access to academic papers, access to lecturers who are presumably also doing research in a similar field and you are supposed to use all this to learn stuff yourself.
The lectures are there just to give you guidance as to what direction you should be concentrating those studies and the assignments are just there to make sure you are.
Everybody feels like this from time to time at University and lots of people don't make it. The retention point from fist to second year is usually around 30%. If your group is 100 now there will probably only be around 15 by the time you get to graduation. Also the first year at most British Unis is usually just BS work just to separate who is dead weight and who might be a better candidate for a different course. You won't get to the real degree content until the second year.
If you want to work on something else then do so it as well.
You haven't really given a good enough reason to leave Uni. Its not taking up too much of your time for you not be able to work on something else. You only have about 20 hours of lectures a week (and you aren't even attending those) so there is nothing stopping you from writing your own game or starting your own games company whilst still being at Uni.
Money isn't really an argument because although 9K a year seems like a lot. You aren't really paying it the tax payer is and you won't pay any of it back until you earn over 25k a year and even then its a tiny amount that you have to pay back.
You are also attending a degree that pretty much guarentees you a well payed job at the end as long as you don't balls it up.