Is it worth getting tested?

for reference- I am 14, and even though I find school in general harder than most people - I still get top grades bcs I put a lot of effort into it.

but I literally cannot focus i have like a million thoughts in my head.. I start drawing flowers randomly on everything I can - and I recently got headphones - just so that they could cover my ears bcs I feel better that way. but my parents are telling me to stop being silly …

I have random voices speaking in my head - like I play out convos unconsciously and they r about the most random stuff - and half the time I don’t realise it.

I HAVE SO MUCH INTERNAL DISTRACTION

every week - I have like a fixation, like I will be obsessed with something for the shortest period of time, spend a bunch of money on it, and then forget about it.

and lastly I cannot sit still for the life of me.

my parents don’t want me / are not letting me get tested - bcs they don’t trust diagnoses and also they think it will hinder my chances of getting into Oxbridge or getting a job - they also think it’s a load of baloney - plsss any advice 🙏🙏🙏

thoughts?