Don't drop out. And keep your science degree and minor in something you like. I recently graduated last year and have been struggling with the same things you are. After a year out, I realized that while having passion is important, it shouldn't control your life. I spent so much time trying to follow my passion and I realized it kind of made me miserable. Sometimes passions are better as just that, passions. It was easy in college when my parents were helping with tuition to say "Yeah, I need to follow my passion, screw security".
Yet a year after graduating I am slowly figuring out that maybe what I want is a career I'm interested in, and have my photography and writing as a hobby that someday I might turn it into something more. My background is creative writing, but I minored in exercise science because i also really liked that. So I have most prerequisites for graduate school in a science related field because I realized I didn't want to just survive for the rest of my life and have to always be asking my parents for money. It all depends on who you are as a person. IF you are okay with living off your parents hard work for 10 years or so, then yes maybe following your passion is a good call.
This is all assuming you're passion is non-scientific. Maybe you just need to find the right application for science. There's tons of stuff, which is why I say keep it. Doing something and being able to live off of it sounds a lot more enjoyable then following my passion and not being my own man. Doing something, anything, is alot better than being a bum and skiing all day. It's not giving up on your dreams, its' just adjusting your dreams and fitting them into a reality where they are manageable. Feel free to PM or anything, I've really been struggling with this shit too. I wish I was like one of those kids who knows at age 10 what they want to do.