This subthread is about the possible/probable genetic reasons why some people have more trouble adjusting their sleeping habits to that of everyone else. Saying that he just needs to adjust his sleeping habits is not really helpful.
OP sounds depressed with a self-defeatist mindset. He considers himself unemployable because he is a night owl. I don't know if telling him 'It's okay, it's not your fault' will help his situation. And I don't think what I'm doing is similar to telling a paraplegic to just try really hard to walk - is there any science that these 'hardwired night owls' can't actually change?
Also, I'm curious what your natural bedtime would be if you not only removed clocks, but also removed TVs, screens and other artificial lighting. It seems unfair to say you would do something 'naturally' without clocks, but not without all the other technology that is actually causing you to stay awake at non-natural hours in the first place.
I'm unemployed now (last 14 months), and I've given up so that I don't even look for job anymore since I don't think we'd be compatible. Saves my time and employers money.
Yes I'm slow-starter - it takes me from 1.5hr to 2.5hrs in the morning to start my day. Now I usually wake up at 7:30-8:30 because I'm happy owner of six parrots and they need maintenance and to make a lot of noise :)
All this combines with my inability to stick to just one single thing to do. I have to change stuff I do very often, which leaves many of my projects unfinished. From this reason I usually find myself very unhappy working on some project for longer periods, especially if those projects are too complex to even start contributing - because of this I then usually used to start working on something different in my "free time" (in member of local hackerspace) and my productivity (if there was any) goes away. This allowed me to acquire quite a lot of different skills and knowledge but left me uneployable.
Or maybe I just haven't come across a job that really suits me and be appreciable, yet
It sounds like you have other problems that are preventing your employment that are not related to you being a night owl(I don't even think you're a night owl...you self-admittedly wake up at 730-830am).
So yeah, maybe there is some reason I've never discovered why it shifts so much (eating habits, weight, general mood) - but I can only say it shifts every few months or years and hasn't significantly changed since I am an "adult".