This may be a n00bie question, but hey iam new

But I see people with their knee's on the ground racing... I find that if I try to lean my footpeg touches the ground. I have a cag mk2 atm, is it possible for me to get my knee down if I adjust the footpegs in some way? Or is it when you wear bulky bike trousers that ur knee touches the track? Hope someone can help me out Thanks