I know nobody’s going to listen but…
Over 3 inches shorter than Hora here at a smidge under 5ft11. Used to own a 29er Inbred… Ummed and ahhhed for a while over sizing as wasn’t sure whether I should buy the 16″ (obviously too small but I’d have ran a longer stem to compensate) or the 18″… In the end common sense prevailed… I bought the 18″ and ran it with an 80mm stem, and it fitted like a glove. The 16″ in hindsight would have looked ridiculous, and been less comfy!
Technical riding has FAR more to do with your ability rather than riding a bike that’s too small for you…
Not getting beaten up on a hardtail has for more to do with your strength and fitness than your age…
I can understand if you can’t be bothered to get stronger/fitter and just want to buy a full sus for comfort, that’s totally fine, this is a hobby and is supposed to be fun not a competition. But FFS buy a bike that fits properly otherwise you’re going to have the same problems again and again!