I'm not going to say anything about dating sites because I've never used one.
I have been to University and so I will talk about this. First of all, you will meet fantastic people at your University almost immediately. You just need to try and be a little pro-active and brave when you arrive and introduce yourself to people living around you. This will get you involved with a wide variety of people and from there you will start seeing those who you have connections with and those who you don't. Usually, your roommate (if you are living in dormitories) will be a great friend and ally in your first year at University if you can be friendly and flexible. Not all roommates are perfect or nice, but generally they tend to be people you can trust and get a long with. Use your instincts.
After this initial stage of meeting people (practice remembering their names it makes you popular to know everyone by name quickly) you will spend more time with those you connect with and among guys can start scouting for a person you'd enjoy being in a relationship with. University is a time for experiences and finding what kind of life journey you want to take. You will make mistakes and you will make wise decisions, but by believing in yourself you will find your true path. Part of this path will be finding the right guy for you.
I had many girl, friends in university who were new to dating or virgins or both and it all depended on them when they wanted that experience and who it was with.
Short story, I believe University will bring a whole lot more towards your dating/personal life than a site will, and you are at least guaranteed the person you meet was at least able to get into University. :)