Hi ImagiNada glad you found what we lovingly call "the nutty board".
First thing, good fo you for addressing your weight when you are still so very young ( yes I peeked). It seems like you understand that this is indeed more than just losing weight. The biggest battle with weight loss occurs between the ears. The mind set is the most important thing to succeed.
When you are starting out or starting over, you may not be able to leap right into all the changes right away - drinking water, exercising, following a food plan.. etc. It can seem so daunting when you look at it all together, that some times it is best to make one change at a time. Start with maybe increasing your water intake , then start with going for a 15 minute walk a day... etc.. baby steps. This is all made up of little changes.
As far as eating what is "bad" for you, remember there is no bad or good food. There are better choices and the trick is to balance better choices with living your life. A steady stream of tasteless "diet" foods is sure to derail you. This is a change we need to make for the rest of our lives. Find a plan you can live with.. low carb, weight watchers, calorie counting, sugar busters, the fda food pyramid..and a zillion more. One thing that I can promise you is that healthy food CAN taste good. Learning to use fresh and dried herbs and spices can really liven up food. Don't be afraid to try new things.. as well as things you may have disliked in the past.. but prepare them a different way. I never use to like zucchini, sweet potatoes or tofu and a few other things. Now I love them. It just took finding a way to preapre them that I liked. You can also experiemtn "lightening" up some of your favorite foods.. that can be an exciting challenge.
One program a lot of ladies here seem to like is TOPS. I believe it costs like $1.00-$2.00 a week to go to meetings. There is a board on 3FC that could answer a lot of your questions. It isn't expensive and since you are young I am guessing you aren't made of money.
It is hard work, but you have to care enough about yourself to accept the challenge.