Re: I really need advice
You should not be worried. You are describing what happens to the average guy. By watching certain types of videos, you excite your brain somewhat like a mental version of foreplay. When you reach the point of physical stimulation, your brain is so excited that it quickly releases. Unless you become addicted to the videos, you are not going to have problems later on.
Just remember that whether you are watching movies appropriate for your age or pornography (which you should avoid if you are not old enough to watch it), many of these items create unrealistic expectations when you eventually reach the point that you begin having sex. Because your brain thinks the movies are real, it is sometimes disappointed in reality and it makes you feel inadequate. Therefore, do not believe everything you see and do not be disappointed when you are not able to do something you saw in a movie.
Good luck to you.