I agree with SexHelp. Many people, male and female, start having sexual desire at a very early age, even as young as 4! (Seriously) The belief this begins only later teenage years is false. Your desire is perfectly natural and so is masturbation. Masturbation will be important in later life as well. One of the most common prescriptions given to men and women experiencing sexual problems is for them to masturbate.
It is not dirty, evil, or even sinful. There are those who strongly disagree, of course, but health professionals strongly believe it is natural and healthy. And they ought to know since health care is their expertise.
As for sounds being made, that is very common and really can enhance the whole experience. If sounds come naturally to you then I wouldn't suggest holding them in. Sometimes there are sounds produced from the masturbation itself, such as when using lubricant for example. This is nothing to worry about either.