Confidence issues!?

Im at the end of my first year of university and looking back on it i feel depressed that i havent made the most of it socially and this has an effect on my motivation to study. Comparing myself to the select group of friends i have here i dont really no anyone, and those i do no outside of this select group of friends i havent really forged proper freindships with and dont really feel totally at ease around them and cant be myself! I spend far to much time thinking about what to say and what people will think of me if i say it. I know its all to do with confidence and sharpening those social skills! but it would help to know if there are other people out there who experienced simliar problems and how they dealt with it! Thanks