Hi i m 23 years old student nd i never have sex .i m very afraid of my penis size it's 4.5 inches long nd not so much in width what should i do please?

Well, in truth: I wouldn't think about it so much. Don't identify yourself by that. You will likely hit your stride soon and become sexually active. When u do it will be fine. Sometimes people that work hard academically delay gratification, don't have sex then feel flawed; like it will never happen. It will, keep working hard.. Don't let it hang u up, trim the hair around it if you want it to appear larger.