Missfit,
What you're going thru is not unique: as others have stated, you've had your entire support system and comforting world view yanked out from underneath your feet, and that's an incredibly uncomfortable situation. Your reaction to a loss of faith in your religion is just like any other loss, be it a loss of a loved one due to death, or a possession, or loss of a relationship (friendship, romantic via break-up, spouse via divorce). You're going to experience these feelings: it's perfectly natural and expected part of the grieving process (FIVE steps, although variable, and with cycling, backsliding, etc, are: denial, anger, bargaining, depression, acceptance).
Remember that even if you are only one of 7 billion people on the Planet who is alive right now, you have SPECIAL importance to those in YOUR life, EVEN IF THEY AREN'T ABLE TO REALIZE IT NOW, due to their emotions being hijacked by those who took over the cockpit of their minds for a foolish man-made theological purpose. Are you willing to put your family thru the pain of your suicide? If so, then they MAY not mean much to YOU, since suicide often can be a very self-centered act.
As the Beatles said, the love you make is the love you give, and in the end that's all that matters: building relationships with others, who ALSO will someday die. We're all basically just a bunch of fire-flies, here but for a short time. Don't make it any shorter than it need be.
And YES, the God concept IS "mad-made": that's EXACTLY what makes it so utterly worthless, destructive, and dangerous, in that there's SOLID EVIDENCE that belief in God(s) is simply mankind wishing them into being, to project their OWN image and power. Don't let the loss of an false image, something that never EVER WAS real, allow you to miss out on what IS real, the beautiful World around you that you've looked at, and haven't even yet learned to "see".
Adam