I don't know how do do diet little idea about diet calories plz tell me which food I eat n how much oil I use in foods how many calories in roti?

Best start. I'm glad you're interested in healthy eating. Truth is, Brian, that nobody loses weight by focusing on counting calories. It's a lifestyle change. Avoid very greasy, very sugary, and very salty food. Try to eat smaller portions, and get enough lean protein. Especially, hang out with people for whom exercise is an important life focus, eat and exercise them; work hard and they'll accept you.