It's probably best to avoid the combined patches for multiple reasons. Firstly the type of P they include is not body identical, it is a synthetic progestin - not the natural body identical progesterone your own body is making. So it will not replace your missing hormones and it does have a higher risk profile in terms of BC risk, lipid profile etc - in other words, it's not great for you if you can avoid it.
Second, it comes in a fixed dosage of 50mcg of estrogen in the combined patches. If you need more than this (or less), it is not possible to adjust the dose of E and P independently of each other. If you take a separate E and P you can adjust each separately.
The combined pill contains synthetic hormones, both synthetic estrogen and synthetic progestin. It does not replace your missing hormones. Your GP is incorrect and a bit ignorant if they expect it to. The only exception to this is a combined pill called Zoely and another called Qlaira which contain body identical estrogen - but still a synthetic progestin. All other pills contain synthetic hormones.
You are not too young to have symptoms or to be on HRT - but if your GP gets difficult about prescribing HRT at your age, or about increasing dosage etc, one option is to try Zoely so that you at least get body identical estrogen and then can transition to HRT in a few years.