The freedom of university life comes with great responsibilities. You are no longer under the guidance and supervision of your parents and family, neither in the security and comfort of your home, nor in the company of loved ones who are willing to cater to your needs. You are in a new environment where not only are you 'free' to do as you please without anyone giving you a second look, but in fact 'encouraged' to do all it takes to fit in with the crowd.
As a Muslim, you know better than that. The people you will meet do not have the same priorities as yourself. In fact, most of them are not sure 'what' their priorities are or if they have any to begin with. You will hear the word 'fun' a lot, which will be used to justify almost anything imaginable and sometimes beyond! You will face situations where all that is between you and the greatest Fitna (trial & tribulations) is your Muslim identity, self-dignity and conscience.
Dear brothers and sisters, be on guard and know yourself. Think about why you are at university, for whom are you putting yourself through this, and what do you hope to achieve in the end? As in life, you must be absolutely sure of your 'purpose' and 'direction', or you will lose yourself in the crowd. Know that you are a Muslim, know that you are His servant, know that you are His Khalifah (vicegerent), and know that you are accountable to Him first and foremost. And what greater sense of purpose than to know that your goal is Allah(swt)! But if you are going to university only to have fun, then know that there are far less expensive ways of doing so.