Can anyone tell me about LDL Cholesterol?

So I got my blood test back. My LDL was 100!!!! To my knowledge, that is terrible. I looked up ways to lower your LDL. It talked about high LDL because of being over weight and eating healthy and losing weight will lower it.

Here’s where I’m confused... I’m 5’6 and 115 pounds. I’m very active and I don’t eat much fatty foods unless I’m absolutely craving something haha

My doctor didn’t say much except that it was high.

How can I lower it because I’m really worried why I have such an extremely high LDL