I know that going into college the general understanding was "do biology and go to medical, dental, pharm, opto, or...ect professional school"
Once in college I realized there were many more majors that were just as suited for these professional schools. I ended up switching from biology to physiology and am definitely glad I did. Other majors I think are pretty cool are neuroscience, immunology-microbiology, molecular cell-developmental biology, and biochemistry. UCLA offers a lot of majors though, but nearly all schools have a kinesiology/physiology program.
In essence all of these majors require the same core content that bio majors cover but the upper division and major specific courses may be more interesting to some than straight bio. You might be dead set on biology and that is great, but there are other fantastic majors out there as well.
As far as difficulty, I would say getting a science based bachelors degree is very difficult. It takes a lot of energy and a serious investment to fully understand the concepts. What's exciting though, all the concepts make sense and you start to really appreciate the world around you substantially more once you really grasp the material. The fact that you're on SDN as a freshman in college is already putting you in a great place to succeed.
