Masturbation is a normal physiological activity seen in young people. However watching porn movie compulsively is not healthy. You need to exercise self control over getting stimulation through porn movies. White fluid which you are talking about is prostatic fluid which is secreted due to sexual excitement. In short there is nothing abnormal with you.  The only way you can get rid of this habits is by self control and distracting you self while you have an urge to act.