Want to drop out but not sure how to go about it.

3rd year history student. Dissertation due in a month and a week and I haven't even got a damn question/title for it yet. I got pushed into this course by sixth form and wanted to drop out since the latter half of 2nd year, but didn't, thinking surely it couldn't get much worse.

I have no idea what to do for my dissertation, there is nothing in the entire course that has been particularly interesting, I have no use for the degree and will not go into a career where it will be useful, there's no reason for me to continue and go through the stress. Dissertation just looks impossible to do and I don't even care about the grades anymore and haven't for a few months, as long as it passes, it passes. I've been getting 2:2s so far when I used to get high 2:1s. I don't care for the course one bit and haven't for a while, I like to describe it as "a cancer that saps any creative thought and all inklings of happiness".

I'm not sure how to go about it. I'd happily go on if I could just not do the dissertation (1 module), fail it and then do the other 3 modules that I have left since one of the way grades are calculated is by the median of all year 3 modules, however, I'm pretty sure failing a module means I can't pass at all, might be wrong though.

What happens with student loans if I drop out? Do I start repaying them as normal, just like if I finished my degree?