Is dropping AP Physics going to hinder my chances of getting into my applied UCs?

Currently I’m taking:

AP Physics
AP Lit.
AP Govt.
AP Calculus
Leadership

And AP Physics is by far the hardest class I’ve taken ever. I struggled through it during first semester and the future doesn’t look very bright. I study a lot for the class but it doesn’t seem to click and I’m considering dropping the class out of fear of getting a D or a Fail this semester. I have A’s in all my other classes besides this one which I got a C in. I want to get some input about whether dropping the class will affect my college admissions. I applied to UCLA, UCSD, UCI, and UCR.