Please help i smell real bad in school?!!?

ok i started going to this other high school last week.first day i smelled normal then the next day i stunk real bad and its been goin on since!in the morning i smell ok i get to 3rd period and i smell bad like sweat/burning wood and pizza and i dont even eat pizza!i never eat lunch at skool also!i dont know why!im the cleanest person i know seriously...i shower twice daily morning (shampooo/conditioner for hair and dove for my body)and night,brush/floss/rinse my teeth twice as well....my clthes are always clean..i always put lotion on my body i use great deoderant point is i never had a body odor problem till now why is this happening?ive read that also some other ppl have gone threw this why does this happen?should i see a doctor im so embarrased to go to school now cuz i think ppl around me talk about me aredy and i see ppl around me move seats all the time...i even walked out of school right now cuz i was embarrased....this is driving me seriously crazy......its making me not want to go to skool and it suks cuz i actually like skool now seriously should i see a doctor tomorow??