I have rectal bleeding with every movement  & now bleed sometimes when passing wind, my doc said hemorrhoids but I'm getting really worried. I'm 24?

Hemorrhoids. Hemorrhoids is till the most likely diagnosis, but the amount of bleeding can be worrisome. Best to return to your doctor, or consider seeing a gastroenterologist.
Even so... Even if this is "just hemorrhoids" you should not just live with it. If stool softeners, water, fiber, etc are not working, see a colorectal surgeon - they can get to the bottom of this quickly (i know, bad pun...).
Don't worry. Get educated, informed and checked. An anoscopy can show bleeding coming from the hemorrhoids and a sigmoid or colonoscopy can look into the intestines to make sure nothing more serious is coming from higher up.