I need tips on how to masturbate fast

By masturbate fast, do you mean you are trying to ejaculate quickly?  One way to achieve this is to make sure you know which part of the penis provides you with the most stimulation and concentrate on that area; for many men, this is the glans (the mushroom head).  Also, it often helps if you achieve a full erection before starting to physically masturbate.  Another good option is to create mental fantasies that really turn you on and concentrate on those as you masturbate. Finally, it’s possible that your penis sensitivity is low; try using a good penis nutrient cream (health professionals recommend Man1 Man Oil) that contains  acetyl L carnitine, which enhances penis sensitivity.