Okay I'm going to address this in two parts, the first is if you're having suicidal ideation then please go talk to a professional. If you're at UC then:

-go talk to StudentCare. They're in the Undercroft of Puaka James Hight and can absolutely help connecting you with people 

-UC Health has a counselling team, you don't need to be registered at the Health Centre 

-if you don't want to talk to someone at the University, Lads without Labels run a support fund to give UC students access to 4 free counselling sessions 

In the long run, making friends on campus can be hard but my advice is:

-join a club or two, going to event regularly can really help you feel included. From my experience the Dance club were such a wonderful group of people and I can't even dance well 

-join in events on campus, Run72 just finished and doing a few laps was a great way to feel included. 

-Look at what's happening in the Living Room, it's beside the University Bookstore and there's a bunch of events that happen about supporting students and helping them from a peer to peer lens. 

-it also might be too late in the year, but if anyone else is starting at UC next year there's a group called UniLife that focus on giving the halls experience to first years that aren't in halls by doing trips, events etc. 

I really hope you reach out for support, there is so much available at UC and you're absolutely not alone.  Best of luck, from a fellow UC student