I have personally had many sizes of penis over the years and I can assure you, it's not the size of the dog in the fight, it's the size of the fight in the dog. One of my best **** buddies was smaller than you and we had a great time together. I didn't even notice he was small at the time, I only realised it later because he was the only guy I have been able to give a decent blow job, and I only realised that when I was complaining to him that I'm apparently bad at giving head and he told me I was the best at it. Some girls just don't notice.
Seriously dude, if you think this is worth topping yourself over, you need to get out in the world. Go talk to some homeless people, go help out at a shelter or soup kitchen. Go visit the cancer ward in a hospital. You are letting this get to you.
How old are you? How many women have you been with? Have you actually pulled down your pants and been laughed at?
I understand that this is an issue, and while I am not a guy I can relate in a way. I have always been very small busted to a point where I was frequently mistaken for a guy in my teens. It wasn't until I accepted that I could still be sexy with handfuls that I actually started to feel good about myself. Seek some counselling if it worries you that badly. I'm sure you have more to offer a woman than your penis.
'People are never perfect but love can be. People waste time looking for the perfect lover rather than creating the perfect love' - Princess Leigh-Cheri from Still Life With Woodpecker.