hi.. thanks for writing.. i have understood your concerns... early ejaculation is common problem in those who masturbate..that depends upon the your technique of masturbating... premature ejaculation is called premature when ejaculation occurs before intention of a male [prematurely]..there are so many causes for premature ejaculation..anxiety about the sexual performance and partner s satisfaction is the common cause..after bad performance the anxiety starts and it further worsens your performance..so u need not worry about it.. there are some behavioral methods u can try for delaying ejaculation..these techniques are , squeeze technique, atop-start method and other interruption techniques..the details of the technique u can read from the internet and practice while masturbating and even during sex..the result u ll get after successful practice for long... there are drugs which delay ejaculation but u need not take them at present because u are not married...if the problem continues after marriage also then u shud consult a sexologist and follow his advice.. i hope u ll find this advice helpful... best luck..