How to lower my cholesterol?

I have really high cholesterol (280) it’s part hereditary and also because I used to eat very unhealthy as a child. I am 18 years old and on Crestor to lower my cholesterol. I am trying to eat more healthy but is there something you can eat to lower cholesterol? I’ve heard of oatmeal but that’s about it.
I am exercising almost everyday for 25-30 minutes so hopefully that helps too!