good advice
Writing is not my full-time occupation. I like to eat. ;-)
There have been successful writers who knew they wanted to be writers as teens, and went to college with that career in mind. On the other hand, there is something to be said for having experiences in other fields, and there have been many who took up writing as a second, or even third career.
For you, if you're starting to wonder if you've chosen the right career, it might be time to sit down and have a honest talk with yourself. How much do you enjoy chemistry? Is it something you're really interested in, or are you just doing it in order to get a good job in the future? Even a job in a field you're interested in can be hard. I work in the architectural and engineering field, something I've always been interested in, but it can certainly be hard sometimes to get up and go into the office. Don't make it hard on yourself by choosing something you're only half interested in, whether writing or chemistry.
Whatever you decide, I would urge you to finish college. Do not fall into the trap of thinking it isn't important for whatever you plan to do ("Writing? Well, you don't really need a degree for that . . . "). It is important, and will offer you choices down the road.
Agreed. Life is definitely too short to do what you don't want to do, and there are plenty of occupations that put food on the table without turning you into a mere wage-slave.
The good thing about an undergraduate degree is that you can alter course later in graduate work. I hate psychology, so I'm not planning on continuing in that after my BS is finished. My middle son's current teacher was an MBA who went back for a teaching degree, and my eldest's teacher was also in a completely different industry and country up until a couple of years ago.
Oh, and this also reminds me of my favorite things Kurt Vonnegut ever said. Unfortunately, I can't find the exact quote and my brain is not working the way I want it to this morning...but... the general idea was to do SOMETHING, anything before trying to be a writer.
Have a job, travel, parent, volunteer, study, become a human lab rat, whatever, but have some experiences and find something to say.
I think that's good advice.
Just my two bits, added to alleycat's already awesome tips. Definitely get the undergrad in WHATEVER (remembering that some of the lower level coursework is common to everyone and that you CAN change majors if you need to).
Good luck