First semester calc, basically derivatives, isn't too bad in terms of its mechanics. The theory behind the work, tho, is pretty tough.
The second semester, integration, is far tougher. There is no real way to simply ignore the theory, and your trig knowledge will be put to a severe test.
Why major in comp sci? I've got a liberal arts degree (econ), and I've been in IT for 11 years now. You can make a very good living as, say, a Cisco tech, or a network engineer, etc. Even better, most IT work now is in project management and security / compliance.
Unless you want to be the one designing the next generation of processor chips, or heading up the project that develops the next hot programming language, that is.....