Considering that for what I want to do in life, I really only need biology
At your young age, it's difficult to know what you want to do in life and what you'll eventually end up doing. I took calculus-based Physics as an undergraduate in college. I hated it primarily because the textbook was terrible. Later in life, I took another course in calculus-based Physics, and found that I loved Physics, primarily because the textbook was well written and was even exciting.
As far as a career in Biology today, perhaps you may be thinking along the lines of medical or nursing school or even pharmacy. All three of these areas do require that you understand some very basic principles of Physics. Some related to concepts in Physiology are :fluid dynamics, pressure/vol relations, mechanics, tension, friction...etc.
Depending on the teacher and the text, Physics can be very exciting.
As far as Biology today is concerned, much emphasis is placed on biochemistry, molecular biology, molecular genetics, developmental biology, analytical biochemistry and various aspects of physiology and biophysics. These are all areas that in one way or the other do require a knowledge of Physics.
Your interests will change as you age. As a kid in college I hated English, because I was interested in a career in science. Now as an adult, I love poetry, literature and various aspects of scientific writing.
One other point to remember, the careers of today, may not be available 10-25 years down the road. You may have to change careers at the age of 40+ and to do so, you will need to have an education that not only covers basic science, but also covers many aspects of the liberal arts and humanities.
One last thing about Physics, if you think about it , isn't Physics important to many ( if not all ) ballet movements?