Hello... I'm 18 years old guy and I'm a gay . I want to become straight as soon as possible I feel really shamed to be gay sometimes I try to commit suicide bt I can't . Actually I have done sex with many men whom I know and from those persons some are like they are using as tissue and throughing it away. I am really fed up from all these they have made my name much dirty in society that I every time get afraid that my parents don't get to know about this... plzzzzzzzzzz help me to become straight I really want to get married to a beautiful girl in near future to fulfill my mothers wishes and also I'm interested in women also bt when I see a naked man I get that feeling to suddenly do sex with him I only want to be straight please tell me ways how to change my mind...

You can't.
You can avoid having casual sex! Go on dates before you have sex, like everybody else.
Meet a nice guy and settle down, and eventually tell your family.
It wouldn't be fair to a girl to marry her, would it?

Impossible its not the thing I can I have marry a girl because in India this can't be possible to live with a guy forever otherwise second option is suicide...

There must be other gay guys in India, based on what you have posted. Are they married and living a lie?

Another choice is to not marry, but avoid casual sex.

You can help yourself first by not letting these guys use you. That is probably part of your shame... the fact that you are being used. Get over that part first and go from there.

OK I will not do sex with these guys from now and there is no gay near me who is living life with a gay partner..

You're not going to be able to just stop being gay... but I do think that if you stop feeling used, you will probably start to feel better about yourself.

Good luck.

"many men whom I know and from those persons some are like they are using as tissue and throwing it away"

That is your real problem. Don't allow yourself to be used by men or women. It is difficult accepting your sexuality when you are gay. I know from experience. We have been told it is wrong and evil so why wouldn't we want to change. Well I promise you it isn't wrong or evil. It is wonderful especially when you find the right person to commit to. You have learned how to have sex. Now it is time for you to learn how to love. Trust me, love is the most important part of being in a relationship. Don't panic. There are many many many many gay people all over the world. How can that be wrong?

There are gay men in India, maybe not as openly gay as some of the rest of the world, but in the cities it's more and more open.
You have choices to make that aren't impossible. One is to move to the US, Canada, or just about anywhere in Europe or Scandinavia.
Why not go to a large college in England, where there are gay clubs.

Out of all the guys you've had sex with, none of them are out of the closet? You can either continue living a lie, or you can come clean and be proud of yourself. Sexual orientation doesn't define the person. Maybe you should move to a different country if your own culture won't support you.