I hate History A-level!

I'm fine with my other two subjects, but i hate History. I do not find it intresting at all and I also find it very difficult. My teacher is really bad at teaching and I learn nothing in lesson, so I have been teaching it myself at home (I do still attending the lessons though). However I can never remember anything and there's too much. Even just for one topic i can't seem to understand anything, I don't have this problem with my other subjects. I think i'm going to fail AS and if i do i cann't continue the subject to 2nd year.
I would retake the 2nd year but I already was doing AS at another college beforehand, however I moved to this college for a fresh start and never even picked History in the first place. I only picked it because I got reccomended to drop a subject and pick something else up, and History is what I ended up picking up (I did do my research beforehand and it sounded interesting and something I would like)!
I don't know what to do, i'm stressed as hell. I was thinking next year to do as and a2 psychology in the same year if my college lets me but the workload might be too much. If i stay on an extra year just to do a2 will it look bad???

Sounds like me with maths. I'm predicted A*A*U, go figure. Literally ruins me, I should've just took politics or some other essay based subject, might have had a chance of getting into university if I did...