The stream you choose for 12th doesn't have to decide your career after that. It's okay that you were a science student. You can obviously pursue your career in the subject you like. Designing is a wonderful freelancing career that you can mode by yourself using your creativity. Also you can study coding. Interior designing a small like a good career. But you have to do it own your own. But coding may help you to get into any company. You can also do your interior designing while working , as a freelancer. You must choose the subject that you think, you can pursue. I would prefer utilising your creativity, at the same time getting a permanent job along with that.