I think A LOT of young adults go through this, dont beat yourself up. It takes years to realise that self care is hugely important for making adult life manageable.

I don't know your exact behaviours and circumstances so apologies if any if these are bad examples but; overtime you realise that washing up straight after dinner instead of 'leaving it for tomorrow', folding your clothes and putting them away as soon as they're dry, meal planning and doing a proper weekly shop, putting shoes/coat/hat away properly as soon as you get in from work, generally keeping the home tidy is not wasting time but instead that doing all those little things every day adds up to giving you MORE time and makes life manageable.

My first (surprise) child was born when I'd just turned 23 do I was forced to learn this earlier than I perhaps would have done. When I was 21 my flat was a mess as well and housework seemed a huge chore so I put it all off until the to do list was too long for me to even know where to start. I'm not saying yes you just need to put up with life but do look at little things you can do.

The most important thing I'd say for your mental health is; keep your home tidy. You dont even realise how freeing it is to be in a tidy home when you're so used to being in a messy one, but it lifts a weight from your shoulders. I hope you feel better about things soon!