well like wat every one says. it has to do with mentally. well what you can try to do is, you can start with strengthening the PC muscle.
do a google search on that topic and you can get started. secondly its your mind...cause usually when you masturbate, your main goal is to ejaculate quick and this over time has caused ur natural reaction to cum when ever u masturbate. for this, when you masturbate, pace urself and when u come close to excitement, slowdown or stop...try to hold back. then when the feeling is gone, continue again.
well i have no idea wat doctor to go to for these problem. but then working out ur lower muscles helps. this is from my experience.

and bro...having a gf and having sex are 2 different matter. if you GF loves you for who you are, she will help you through this problem too. Trust me. i know.
strong motivation and encouragement from your opposite partner helps in building the mental profile in yourself.

So feel free to find someone who loves you more then you love yourself.

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I think the genuine urut is done by a pakcik or blind man at brickfields. But I also think a few time with the china dolls can help also.