How can I get my penis bigger.? Surgery is right option or not.? Which is the best treatment for this.?

Live with it. Sorry, but you cannot make your penis grow. What you see - is what you get - nothing more - nothing less. In spite of all the ads you see on the internet, you have to live with what you have. There are some surgical procedures to release the penile suspensory ligament, giving you more "useable" length to what you already have, but this can also effect other issues.