Hi, long time user finally introducing myself on the boards

Hi. I have been on this site for almost a year. But i have never really used it to its fullest extent. I have all but ignored the message boards and have used it basically just to track my progress.
I have lost 45 pounds so far thanks to learning my portion sizes due to this site and lots of exercise. Most of that was done in this year. After a very difficult year prior to this one, i realized I needed to take control of my life and figure out what I want and remove all of the obstacles from my path. I realized that my major obstacle was my size and all of the insecurity and self loathing that comes with it. So starting at about 225 lbs at Christmas I am now down to 195 as of last weeks weigh in. I have let school get in the way somewhat and lost motivation recently but I am finally finding it again.
I need to lose these last 20 pounds. I know I can do it! I WILL do it by the time fall semester begins on September 2nd! It's hardcore Cardio time!