If i stop my sport for some months can acl repair it self?

No: The acl does not heal. You may be able to adapt to your acl- deficient knee w/ time but most young adults will have problems. Most common problems include knee instability, meniscus(cartilage) tears, and inability to return to previous activity level.Middle- aged adults may avoid surgery w/ quad strengthening/ bracing and activity modification. Good luck!( see ors).