Is it appendicitis or a pulled muscle?

Basically, the lower right side of my torso is painful and hurts even more when i walk on my right leg and it hurts more when I'm lifting my foot from the ground. also, when i push down on the top my pelvic bone it hurts a LOT but it still hurts to the left of the pelvic bone too.. so my question is.. is it just a pulled muscle or appendicitis??