Streaks of blood on my stool and I bleed during inter course help me?

Needs to be checked. Blood in stool always need to be checked, even though it may be due to hemorrhoids but even at age of 19 you need exam and may need colonoscopy.And bleeding during intercourse also needs to be checked by your gynecologist to find the cause.
Blood in stool. Standard work up for blood in stool is a colonoscopy. It could be just from internal or external hemorrhoids. You should see a gastroenterologist or a primary care doctor at least to begin with.