I'm not out of university yet, but I have had student jobs as a programmer and I know a few people who have started working.
Don't worry too much about your first day. You'll probably feel useless because you still have to get into the swing of it. Your employer knows that and he probably won't mind. No one really accomplishes anything on their first day, you'll just spend a lot of time getting set up and figuring stuff out. There will usually be a bunch of more experienced colleagues who will guide you through it. If you feel like you're the brightest bulb in the box when you're just starting out, then unless you are truly a genius, that's a bad sign, because it means that you'll have to rely on yourself to gain experience.
You're not likely to start out on a brand new project from scratch. You're unlikely to be in charge of a new project, unless it's like a really small internal tool. Again, if you feel like you're immediately in charge of the advanced thing in the shop, that's probably a bad sign. A lot of software development is maintenance of existing software, so you're likely to start out implementing simple features or fixing bugs.
Also, most software companies don't write software like Microsoft Word. Most of them write pretty niche software that you probably never heard of, and a lot of them don't just sell a boxed piece of software, but make most of their money from service contracts. There are even a lot of companies who only work on software they use internally, where the success of the software is based on the increase of productivity, instead of their sales. A lot of software is based on web technologies these days, too.
Anyway, you know 2 languages and you've dabbled in a bunch of other languages, which already puts you in a pretty good position. I know a lot of people who start out only really knowing one programming language. You don't want to be that guy. Always broaden your horizon. Always be prepared to learn, a lot. A huge part of software development is just learning new things.