College Kid trying to lose weight!

Hi everybody! Im Jessica, 21, & I have always had weight problems my whole life but it got really bad in college. Freshman 15 was more like freshman 30 to me! I had lost a bunch of weight my second year but gradually gained it all back PLUS extra by my senior year (which i'm in now) My ultimate goal is to lose 100 pounds but I KEEP losing focus and reverting to old habits and ways :( Today marks the 2nd day of my fitness REVAMP! & I really wanna stick to it!