Losing my college weight

Hello,
I'm about to graduate from college and Over my four years I have gained about 90 pounds total. I currently weigh 270 pounds. I want to live a more healthy lifestyle, but I have always had trouble because I kind of just tell myself to lose weight and eat healthier. I think I need some accountability and motivation to start living a healthier lifestyle! My goal is to lose 30-40 pounds by June, as well as make sure that I'm eating a more balanced and healthy diet! I would love some help!!