I am in my 40s and have been running for two months now.

My cadence just won't increase...
When I consciously try to increase it by taking shorter strides, my ankles hurt too much.
Is there a way to increase my cadence?
Or is it okay to just run without worrying about cadence?
Currently, I am running 5km at a 6:30 pace with a cadence of around 160.
I want to run well, but I feel so frustrated.ㅠ