My weight!!!?

hey, im 16 and i used to be chubby n fine till a month ago but now im in college n there is practically no sports at all..im from india so indians would understand tht better..ya and also when i was in school i was actively involved in sports so i could check over my weight but now im in college from morning 8 30am till evening 5 30pm. so the problem is whn is there time to exercise??well u can but as i said indians would understand the situation better..pls help!!