I am able to pop my knees, like if i were able to pop my back or fingers. that can't be good right? could it be something worse?

Hypermobility: Some people are flexible and thus more play in the joints. This especially occurs in hypermobile people, who have hyperflexibility and thus able to pop joints, fingers, knees, hips etc. Sometimes hypermobility actually is an advantage. Paganini had a flexible hand and this was felt to make him a better musician. Sometimes athletes who are hypermobile have a greater risk of injury.