how can i lighten or remove the scars which are located on my legs?

I’m only 16 so I don’t really want to do anything too expensive but I have tried Palmer’s Cocoa Butter and Bio Oil and they only seem to lighten the appearance of the scar for a little while after i apply it. My scars are approximately 3 years old. Is there any other way which i can use to lighten or completely remove the scars?