Sid, it's also important to understand that Architecture is something that you should only look at if you are passionate about it.
No offense here, but given the other fields you are looking to study are vastly unrelated to architecture, it seems that you're looking into architecture for the sake of it, which would be setting yourself up for disappointment if you pursued it.
You need to be sure it's what you want to do because it's the type of profession where your ability to sell your ideas and concepts is crucial, and this is focused on across most uni's across all the years, where you're concepts are examined and criticised by lecturers etc.
I'm not saying that architecture isn't for you, but you really need to consider the reasons as to why you want to do architecture. Maybe post this in a specific universities sub-forum so you can ask architecture students what aspects of their degree they found the most challenging and why?