You can always talk to a random person here, one that you know is a good listener. There seem to be plenty of nice people willing to listen to you, if you can just get it out there. It's not an easy thing at all - it's admitting "defeat", admitting that you're not self-sufficient. But that's the thing; no one is entirely self-sufficient. There's nothing wrong with you. You're having problems, sure, but everyone does at some point in their lives.
There are also suicide hotlines. Even if you're not truly considering it, those people are really wonderful to talk to, and can help a lot. Services like that and the one at your uni are there for people like you. You won't be taking anything away from anyone else by making use of them, you'll be helping yourself and the people around you by getting yourself to a better place emotionally.