I want that old thing back

So when looking at that picture I wonder what has become of me. Since starting college I eat the craziest foods at the craziest times. These actions have caused me to gain about 30lbs. Ugh! I just want my stomach to be back to the way it was. SO the plan is to start working out religiously everyday for a hour n a half. I wanna look nice for the summer and feel healthy.