"GPs present lack of sufficient knowledge and care"

I rarely do reviews, especially negative ones. That said, I must shed a light on this particular issue as I find GPs approach unacceptable and – to some extent – even ignorant. I have been with the surgery for about a decade now. Despite young age, I have been suffering from many health issues related to thyroid, stomach, etc. 90% of GPs I have had an appointment with present (to this day, may I add) a low level of knowledge dismissing my symptoms and other detailed blood tests that I had to pay for (yes, pay for!), saying (and I quote): 'But you're young' or 'We're not doing this test here' (which is very dismissive). I have been raising some very serious symptoms from last year, they only ever scheduled two tests without an ability to connect dots to my current outstanding health issues.. Fast forward to 2024, we still know nothing (i.e., zero diagnosis), and they've been scheduling the very same tests, and all I'm reading in messages is 'your X test and X tests are both normal' (of course they'll come normal if we're repeating the same tests within only few months apart); they don't even try to follow up or investigate the matter further themselves even though above symptoms have been persisting since last year, and I'm the one who constantly feels like something is wrong, but can't quite understand what it is as GPs don't care enough to dig deeper.