I my experience, I agree with what others say as to chickens raised alone. At least if it turns out to be a rooster, you will be sorry.
I raised a mixed rock rooster alone from weeks 4 until 20 weeks (he was my first chicken since I was very young, a hand-me-down Easter hatchling, and I had no source for any other chickens until that time). A friend gave me two of his hens (which brought with them bumblefoot, scaly feet mites, and other problems that plagued me for years afterwards, but that's another story) and we introduced them.
Years later, this rooster is in the pen with the other chickens, but he is separated from them at all times. He is in an awkward social place-- he doesn't know how to treat humans or chickens. He tries to treat humans like hens (which means trying to grab humans with his beak at times and treading shoes) and he treats hens like objects-- he treads them extremely rough, ripping out tons of feathers, and standing on them after mating. I spend lots of time with him still, but I have to watch out for and understand if I get bit by him.
He also destroyed an eye of my youngest rooster ( a ten pound partridge cochin standard sexed as a female at Ideal-- DOES NOT act like any other cochin I've ever had. Show quality ((until he lost his eye)) but extremely aggressive) who jumped over his five feet tall pen with him once when I was ten paces away. I didn't get there in time. D: That was an unusual and unlucky day.
Learn from my childhood mistakes-- if you can help it at all, don't raise a chicken alone.