I've been down that road of depression you're going through.
Families are pretty good at detecting things. I'm willing to bet they won't be too surprised when you talk to them. Chances are you've been showing changes in your moods and behaviour.
No matter how dark that road seems you must NEVER give up hope. I did once and it nearly cost me my life through suicide. There are always choices.
You're on the right track in reaching out for help. Don't hesitate to lean on friends and family, they WILL understand and be supportive.
Get some counselling. These trained professionals can help you work through your problems. Thing is you have to give it a fair shot. It worked for me and i'm sure it can work for you. In fact you might want to try this place. I used it awhile back.
http://www.calgarycounselling.com/counselling.htm
There is medication out there to help you through the tough times until you get your problems sorted out.
Exercise is great for depression also. The endorphines you get will help to elivate the mood you are in.
Find an activity or hobby that gives you joy. Something as simple as that can help distract you from your depression. It can also boost your self confidence
Best of luck and hang in there!