Guys, I need some advice.

A couple of weeks ago I finished my internship as a sys admin in this medium sized consulting company. When my "contract" was about to expire they offered me a real job doing the same thing I've been doing for the past few months, but I turned it down.

The reason why I did it was that I wasn't really happy with the job. I mean, the people were... fine, the management team was... fine, the actual work I needed to do was... fine. I think you get the idea. The problem was that I never really enjoyed it all that much, and even though I didn't hate it, I wasn't really happy with it, so I turned the offer down.

After giving it more thought and listening to what some of my friends and family members had to say, I started thinking that maybe it was a bad idea to do so. Many people have said to me that I'm making a mistake, that I shouldn't leave a job before I have a new one, and that I should take the offer, work there for a little while and then look for something else.

I always answer by saying that the job market in this field is much more simple, and that it's much easier to find a new job than in any other, but yet again, I'm not sure if I'm making a big mistake with this decision.

Thoughts?

PS: I'm 21, this would be my first job ever