getting control of my weight and life style

Ive been trying to loose weight for almost 5 years now. Since having our second child in Decc of 2011 ive put on more weight and im having problems losing the extra weight. And theres some times that i get so furstrated that i quit and then i get mad with myself for quiting. I need to find a plan and stick with it and i need to find a great support group that will help me and stand behind me when I fail. I dont mean fail as in give up i mean fail as in having a off or bad day. Cause we all know that we have them. Im tired of trying and trying and getting no where i have over 100 pounds to loose and I need to do it now.