Thanks for elaborating wowie hiya! The reason I ask about whether you're mentally aroused when masturbating is that the brain is the biggest sexual organ (you can read all about that here:
With Pleasure: A View of Whole Sexual Anatomy for Every Body ). So if it's not super engaged in, and excited about, what's going during masturbation things might not be that pleasurable. If you're body is going through the motions of masturbation but your brain is somewhere else, then those motions may not feel super interesting. Some ways that people get mentally aroused before and during masturbation include fantasizing or consuming some kind of sexual media. Does that all make sense?
You may also want to check out this new article!
http://www.scarleteen.com/article/bodie ... sturbation . It covers of few of the things you've mentioned in this thread and some of the advice in it may be helpful to you.