I'm a 21 year old male and recently had my first sexual experiences. I was with a girl who was much more experienced than myself, and wanted to try different sexual positions. But, I was unable to do anything other than the traditional missionary position due to the fact that when I'm fully erect, I cannot bend my penis past about a 60-degree angle from my body. Attempting to do so is very painful. Is this a normal issue, and if so, what do I do about it?