This seems to be a prevalent issue for people on the autism spectrum, and I found it to be a question different enough from "do you live alone", that it would be worth asking.
Also, how do you feel about the issue? How would you define "self sufficient"? What about your symptoms, if you are on the spectrum, affects your ability to be self sufficient?
As for me, I would say that:
1. I feel, at least for myself, that although I have a lot of difficulty with executive functioning, and I don't get as much help as I should from those around me (I can be a prideful creature), that I both am and want to be self sufficient. For a while, I was receiving social security checks, and as someone who is healthy enough to work, at the very least get out and do some manual labor, it hurt my ego pretty bad. So, I got a job and quit the social security arrangement. But I'm my own person, and these are the answers for me, maybe not for you (I'm not one to judge). I value my work ethic, and I value getting out there and contributing. Many people here either seem or even pointedly say that they are misanthropic (have an aversion towards other people). But I like people, and want to do things for them; It hurts me and my ego when I can't do things for them. Being autistic, I feel for them, but you know that I just have a hard time feeling with them.
2. I would define self sufficiency as being able to finance your own needs, and organize your own life. However, I don't think that getting help from the other significant people in your life necessarily means one isn't self sufficient. That's where things get tricky for me, and my pride and intuition kick in.
3. Well, it took me a year of stubbornly trying to arrange everything myself, to get into college. I had to learn how to communicate with admissions and finance counselors, to set several alarms for myself during the day, to keep an agenda of important tasks to do, etc. It wasn't easy at all, and I'm still dependent on notebooks and cell phone alarms, writing down my questions and statements before I begin a phone call, and in general having to work every detail out. This process was kind of excruciating, and at the start I failed left and right, confusing important deadlines with each other... What could go wrong went wrong, basically.
And getting my first job was nuts. I obsessed over my resume, and had to improve my writing skills to get it the way I wanted it. With only missionary work as a reference, I probably didn't look like much of a candidate. Then, I got lucky and started working at a local Savemart, found my niche doing inventory, because I do well with numbers and logistics. What I want to do for a career, is do a double major in the humanities and sciences, earn one or more doctorates, and write research papers. I'll be as happy as a pig in mud, when I can write research papers. Finally, I'll have an outlet for all of my nervous energy and hard-lined rational thinking.
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There is no wealth like knowledge, no poverty like ignorance.
Nahj ul-Balāgha by Ali bin Abu-Talib