I'm with Dee. The people closest to us don't want to believe anything is wrong.
Fortunately, it is actually quite EASY to get help. You just have to ask the right people. Calling the suicide hotline or crisis hotline will get you the help you need if you find yourself in a crisis.
But even better than waiting for the next crisis to happen is to start getting help now. Make an appointment with your doctor, be honest about what's going on and get some referrals for mental health treatment. Depression, anxiety, or whatever is troubling you can be managed and treated.