Quitting your job without another lined up - life over?

Obviously title is a bit of an exaggeration.

27M. Burnt out as hell from my current job, and genuinely don't think I can take another day.

I have become extremely depressed and actively dread going into work every day. I've been here for 4 years.

I am actively looking for another job, but I don't know how long it's going to take me to find one.

I have savings and investments. Living costs are probably around $800 a month, give or take. Only debt is a HELP loan and I have to pay about $5k of that off right now.

I currently live at home still, and my parents are adamant that I get a new job before I leave.

Yes, I realise that's stupid to say as a fully grown adult, but I don't want to piss them off as it's still comfy to live here whilst the rental market is absolutely cooked. I am also the one in the household that works full time.

I also can make extra income outside of work, but it won't be near as much as my current salary.

I have wanted to leave for a long time and I have always put it off in the hope I would find something better, but I am really at my wits end now and it's affecting my life in almost every manner.

I don't want to go backwards though, and am worried about the uncertainty of potentially being unemployed for some time.

Any advice for me?