Some time my hard stool causes bleeding since 11 years old problem now i have swollen anus

IF just : Swollen, then warm baths plain water for 15 minutes 3 times per day, alternate with ice pack and stay at bedrest with feet above hips for 24-48 hours should help. If thrombosed or clotted, see a colorectal surgeon. Best to avoid this recurring by drinking more fluids and less caffeine.

Check your diet: Try some mineral oil at bedtime and check your diet.