PLEASE HELP!!have any of you guys/gals did done the insanity workout?

People say I'm skinny some may say I'm average of slightly chubby in the face but I really want to get toned I'm 17 years old and I wear a lot of baggy clothes not just cuz I like it but because I feel not so good if you knw wht I mean... I mean its my stomach seems to have a big pudge no matter what, my legs are nice my arms they are not that flabby they are fine but my stomach no matter wht if I do situps (which kill me with headaches) or crunches they don't work and I hate them absolutely hate them. I do cardio every other day and was wondering If insanity will help me get rid of this ugly stomach pudge thing goin on... And do you think I can manage doin this in the privacy of my bedroom on small laptop screen? Thankyou!