Become a Java developer

I just made a mistake when I decided to start learning energetics in university. I noticed that this field doesn't make me happy in the last year of studying. I was trying to find job I like after graduating:worked as a taxi driver, then on final control of production line. At some point an opportunity appears to start working in IT, I've started working as QA specialist in same company. I realized that this is what I've been looking for (I mean IT). Now I've strongly decided to become a developer.