OP, something about what you’re saying doesn’t add up.
They’ve bought a £500,000 house, but they work in a call centre. Assuming they are in low paid jobs that’s a £25k-£30k salary each. So £50-60k income and a mortgage probably of about £210k.
They must’ve already had equity in a previous house or have been gifted a hefty amount. Or they’re not on low paid wages at all and you’ve misunderstood that.
My partner works in what’s a call centre environment but with commission can easily take home £4-6k a month in busier months.
Again a Range Rover, on a rental they’re £350-£500. You’re not going to get that on a low wage.
So I think maybe your assumptions are incorrect about them being undeserving or you’re not looking at the situation fully.
But more so, there is no point in comparing yourself to them. You’re a) comparing yourself to a situation that you don’t understand - even if they had help financially it is entirely with a relative’s gift to do that and b) focusing your energy in the wrong place.
Comparison is absolutely the thief of joy. You’ve chosen to be a paramedic. That’s your path and that’s your passion. But there are sacrifices that come with that and one is salary.
But as I’ve said to my higher earning partner, I’ve got a lower paid job with a much higher pension provision, and if you’ve been in yours since before 2015 you’ll be on final salary which is a gold plated pension scheme you literally cannot buy.
So don’t compare and if you must, at least a look at the whole. But it’s more helpful to think about why you feel hard done to, and what you can do about it to either change your life or change your perspective.