Sick of trig

Well, firstly what exam board are you doing ?

Secondly, a lot of the second year topics are conceptually difficult topics that you can't really master without thorough practice. It's annoying (if you don't enjoy maths) but that's just the way it is.

I personally can't suggest how to make it more enjoyable since that comes to me pretty naturally as maths is literally one of my favourite things there is. But intrinsic motivation (whatever that is for you) will work far better than extrinsic. Positive motivation is often LESS effective than negative, but not always. For me, positive is significantly less effective. But for some people, negative motivation actually causes them to give up. You need to work out what works best for you and feed yourself a heavy dose of that so you can get through the topic of trigonometry. Because trigonometry is the second biggest topic in Maths A Level (after Calculus). So it's important to have a strong understanding of it if targeting the highest grades.

I also used to really enjoy maths and I even didn't mind trig but it's feeling repetitive for me now and I am starting to enjoy it less. I'm not sure if this is because I'm having to teach myself since my teacher doesn't really teach or if all my subjects are just getting too much for me at this point.

My exam board is Edexcel, we use the books given by them and I thought it would be helpful to do most questions in there but many of them don't seem to be helpful. I've been watching a lot of videos recently on maths that aren't relevant to anything I'm doing but I find them really interesting. I think my issue might be that I'm being told to do stuff but not understanding why I'm doing it so I'm not having fun doing it.