1. Remember that you will probably not graduate with a 4.0. Your first C is going to hurt, especially if you were an A student in high school. Just keep going.
2. Don't worry about the impact of switching majors or programs. I started my school in the computer engineering program, hated it ~2.5 years in, and switched around a bit. I'm now graduating with a degree in pure mathematics. Study what you love -- the jobs will come.
I'm afraid I'm starting to ramble, so let me get to the main point -- what you study means nothing after you graduate. Where you study means (almost) nothing. What matters is who you meet along the way, and your actual accomplishments while in university.
Study what you love. Meet facility, upperclassmen, and other students. Work on writing something cool and useful. You will get more out of school than if you spent your time grinding for a perfect GPA.
2. Don't worry about the impact of switching majors or programs. I started my school in the computer engineering program, hated it ~2.5 years in, and switched around a bit. I'm now graduating with a degree in pure mathematics. Study what you love -- the jobs will come.
I'm afraid I'm starting to ramble, so let me get to the main point -- what you study means nothing after you graduate. Where you study means (almost) nothing. What matters is who you meet along the way, and your actual accomplishments while in university.
Study what you love. Meet facility, upperclassmen, and other students. Work on writing something cool and useful. You will get more out of school than if you spent your time grinding for a perfect GPA.