Why straight A's? I went to a fairly tough science/technical school, and granulated with a 3.65/4.00. Perfectly stellar, to lots of folk. Lots of freshmen/women have a tough time with calculus; won't say it was easy for me either. Just keep with it....you'll be surprised at what you will pick up on with the right attitude.
And, at that college, we had a feela in my class from Berkeley, CA. Looked like a typical surfer dude, seemed lazy. Well, his dad was a Berkeley prof. He got 4 of the toughest degrees at the time (math, physics, ceramics engineering, and metallurgical engineering), did in 4 years time, with a 4.00 average. Think of how the rest of us felt, especially if he was in one of our classes. Again, this is your first semester? Sit back, take a deep breath, and get back after it. It's your future, my man.