Sukhada, congratulations on doing well on your 12th and the JEE. I have a chemical engineering background and if you are interested in chemistry and math, chemical engineering seems like a good fit for you. Regarding career options in chemical engineering, I tend to disagree with the advice that you have been receiving. Chemical engineering is a scaled-up version of the college chemistry that you have been exposed to.Chemical engineering is a very broad field that deals with making different substances, arranging from petrochemicals, pharmaceuticals, food, advance materials, consumer products etc. So there are a wide range of industries and career options to choose with a degree in chemical engineering. And while some processes involve significant chemical hazards, am important part of the chemical engineering education involves safety. And depending on the sector you choose, the hazard levels involved will be different.
Hope this helps. Good luck.