Jack - I think everyone who uses this site would recognise, appreciate and sympathise with all your current thoughts about this most taxing business. It really does test and thwart one's resolve. And resources! We all have to live, somehow, and lack of income is the killer.
In the good old days, when questioned about the vast amount of money actors could earn for commercials, for example, the response was (legitimately), 'Well, it makes up for all the time spent OUT of work...'
Now...? The money isn't even there for commercials, as it used to be, and it's very, very hard for a working / jobbing actor to survive. So we all look for a sustainable alternative income, part-time or full-time, and some get sucked into that sublime content of having a regular, reliable injection into the bank account that gradually supercedes any artistic struggle to earn a crust here and there. And why wouldn't it? We all have to eat, pay for a roof over our heads, look after our families. Who could not sympathise with anyone throwing in the proverbial towel?
It's rotten that the business defeats so many talented actors. Trouble is, if it's your passion and raison d'etre, the need will never go away and there will still be part of you hankering after it, even though your bank account may be experiencing a happier status / bills can actually be paid / life becomes generally easier.
It would be far better, wouldn't it, if one readily chose to leave the profession rather than being forced to do so?
Best wishes to you. It's a tough choice.