I am in the Science stream and about to complete my 12th. I am now really confused about which career stream I should pick.

This is a very common issue among students, and when they look at different people doing well in their respective fields in society, they get more confused and start manipulating themselves. So the best way to find the right career path for you is by prioritizing your options and choosing the first 2 things you are sure about making a good career out of. Now search the market and make a list of pros and cons and check the positive side, and then choose the best college for the particular stream, and educate yourself as much as you can. You'll find clarity and it won't make you feel confused anymore.