Transgender people often have different gender identities

Every human’s gender is already decided by birth. They are either male or female and grown up by the same identity. But what about transsexual and transgender, they too grown up by the same identity that were given to them by birth but soon they start feeling that something isn’t quite right and they are not complete or feeling comfortable with the gender identity that they were given by birth. They start opposing their gender identity and their mind and body isn’t responding each other according to their gender identity.