I agree with everything that pink's just said. It's similar to when you start work, or move into your own flat, etc. It can feel like hard work getting to know people, but remember that there are others who feel the same as you do right now.
If you can't bring yourself to follow one of pink's ideas, have you considered leaving your course and taking a gap year? If you could aford to travel for a few months, or simply to get a little job for a bit, your confidence could grow in that time, and then when you return to uni, you'll have a good idea what it's all about and what to do.