"Like in the book "Into The Wild". The main character did quite well, even though it ended badly. Even with him, he ate some wild beans that had some bad effect that prevented him from properly digesting food so he starved to death, but there was some bad luck there."
"However, an article in Men's Journal stated that extensive laboratory testing showed there was no toxin present in McCandless's food supplies. Dr. Thomas Clausen, the chair of the chemistry and biochemistry department at UAF said "I tore that plant apart. There were no toxins. No alkaloids. I'd eat it myself." Analysis of the wild sweet peas, given as the cause of Chris’s death in Sean Penn's film, turned up no toxic compounds and there is not a single account in modern medical literature of anyone being poisoned by this species of plant. As one journalist put it: "He didn't find a way out of the bush, couldn't catch enough food to survive, and simply starved to death." However, the possibility of death through the consumption of the mold, which grew on the seeds in the damp bags which McCandless stored them in, was considered a suitable explanation by Krakauer."
Regarding the OP, this may inspire or help you:
It is possible, sure. But living off of wild edibles is difficult. When I was 20 I tried an experiment. I went on a backpacking trip for 3 days without bringing any food, other than an emergency granola bar--which I didn't eat until I was on my way back home on the 4th day. This was in the summer in the woods of PA. I ate a lot what you would expect: raspberries, greens (sorrel, dandelion, cheeses, etc.). But what really got me by was that I brought fishing gear. I ate fish every day for breakfast and dinner, with sunrise and sunset paying off more. Trout, perch, and bass. Okay I did cheat a little bit come to think of it by bringing a small bottle of olive oil, some salt and pepper.
Lucky for me I was around good fishing spots full of fish, or I would have really been hungry. Yet even with eating the wild edibles and fish, I was still quite hungry. I was pretty much hungry all the time, and gathering food and fishing took up most of my time. One night I didn't catch a fish, an okay sized perch, until dusk--and I had been fishing for several hours. It taught me a whole new respect for nomads and primitive man, and humbled me as far as how easy I and most of the rest of the western world had it.
I have given serious consideration to pragmatic homelessness by choice in the past. But this included working part time at some slacker job that was not stressful, like say a record shop or used book store. The plan was to buy a bomber tent, nothing UL--one of those family tents for like 5 people. Set up the tent outside of town in the woods (stealth camping) that was walking distance from public transportation, say a few km from a train station or bus stop. Then just to play it safe, build a shelter on top of the tent to give it extra protection from heavy rain and wind. Nothing fancy, just a sturdy A frame with one of those huge hardware store plastic tarps over a ridge pole.
Next is to buy a gym membership. This gives me access to showers, most importantly, and the gym facilities are just an added bonus.
But I also had a long term plan. The goal was to save up as much money as possible so that I could buy a piece of land after living pragmatically homeless. After I had enough to buy land, then I could move there and build a log cabin and then become a subsistence farmer, totally off the grid.
Then I reconsidered after working out what I thought was a better plan, which was to move out of the US and to Sweden, which is what I did. I now have dual citizenship, and am in grad school, which is free for citizens (as is all public and higher education). I am applying for a doctorate position next week, with the goal of teaching at university level.
In addition to the free education, I also have nearly free (you pay like 20 bucks each visit) health care. My wife and I also got 480 days of paid parental leave for each of our two children. We also get grants from the state for not only being a student, but also for having children. It is also a backpackers dream, not just with the beautiful nature, but also with laws. Water and air are much cleaner, plus there is a law that allows anyone public access to nature. You can read more about that here: http://naturvardsverket.se/en/Enjoying-nature/The-Right-of-Public-Access/
The short of it is that I can backpack and camp nearly anyplace in the wild, and no one can stop me. People's yards are off limit, obviously, but private land owners of wild land are not even allowed to put up fences to stop people from going through it.
Life is pretty sweet over here, and after living here for 7 years now, I have no desire or plans to move back to the USA. My point is that there are other options if you seek to reject dominant culture. You don't just have to become a nomad. But good luck to you and be safe.