Oceana is a bit chavvy. Students go but a lot of the locals who go are either overdolled up girls or wannabe gangsta boys who go round "lookin for da ladiez innit". The more indie places like Cockpit, Wire, Faversham or Stone Roses Bar are more indie-type students plus older locals.
Fab Cafe is quite a funky place which is good if you're just in Leeds for one night and stuck for somewhere to go, its not far from the uni (basically turn right down the road from campus and walk about 4/5 mins till you get to Morrisons and its next to there). The music is varied and there's plenty of space to sit and chat as well as a dance floor.
Again it may be that even these places will ID you and be strict, if you really can't get anywhere then maybe go to the students union and to the Old Bar or Terrace. There are usually bouncers on the door but they won't ID you if you look like a student, they are more there to stop local blokes who obviously aren't students, from coming in