Is a person considered flawed due to the small size of his penis, and are people justified in mocking him because of that? What is the correct way to deal with continuous mockery from others? Is he allowed to marry? And must he inform his future wife about the size of his penis after the marriage contract, given people's mockery?

Since doctors have confirmed that your condition is normal, you have the right to marry without informing your fiancée about this matter. We advise you not to surrender to obsessive thoughts. The mockery of some people towards you is forbidden and a grave sin, as Allah Almighty says: "O you who have believed, let not a people ridicule [another] people; perhaps they may be better than them." Their argument that their mockery is natural is incorrect and does not absolve them of sin. We advise you to be patient with them and counsel them. If they do not respond, then distance yourself from them and abandon them with a graceful abandonment, meaning leaving their company without causing harm.