Congratulations on taking control!
I was the same as you when I was your age. I lost 50 pounds in about two years during college. The only thing that I can tell you that has not been said (definitely take the advice on the cardio/stregth training mix...you have to sweat some of it off

) is that you should do your best to cut out refined sugars and fast food.
I realized that when I started ordering salads and veggies, that they satisifed me just as well as a burger. Meaning that I was not hungry afterwards and actually felt less heavy after meals (and proud for not eating fatty foods), but it is the moment when you order that you must decide to order (or cook) the thing that looks less appealling and greasy.
Also, during my intense weight loss period I always had a huge bottle of water and little zip lock bags of veggies and fruits. The slip ups always happen when you have been running around all day, get hungry and then realize that it is easy to just pick up a sandwich or a plastic wrapped cake at the convenience store

Keep yourself from being too hungry by snacking on sliced cucumbers, baby carrots, cherry tomatoes, apples etc...Not too many bananas. Drink lots of water. It will keep you hydrated, flushed of toxins, make your skin glow and keep you satisfied...Many times when you feel hungry at wierd times, it is actually thirst.
Reward yourself once a week with a lunch of your choosing. Not fast food! But...one lunch a week, say, Sunday, after a good week of working out, eat something you love, but not too much. Serve yourself on your plate...do not leave huge bowls of food in front of you...it is tempting to have seconds and thirds. Eat your meal slowly and enjoy it (you will see how much pleasure you get from eating when you start controlling it). You deserve to be rewarded for good work. This is not all torture and after a while you will see that your body stops craving typical stuff you might eat now. Once you start excercising you will also notice that you will not feel as good and energetic without you regular workouts. The begining is the hardest part, so just keep on track and you will see that is gets easier with time.
The hardest part is deciding to start. I understand where you are, so wish you all the best!
