What kind of son will my girlfriend give me?

There is nothing more I want in life then to sire a robust alpha stud. I was a beta, incel, virgin until age 31. Although I am tall, have hooded eyes, pouty lips, tousled bedroom hair, and boyish good looks, I was cursed with an ectomorphic body that cannot put on muscle. Sometimes I wish I would have been born a manlet with a robust frame. Even a ripped manlet is more alpha than an twiggy tall man such as myself. Anyway, I am wondering what my chances of fathering a robust alpha son are. My girlfriend is 5'6" and does not have an ectomorphic frame such as myself. She is voluptuous and has strong athletic legs. Her calves are bigger than mine and no she is not overweight! So what are the chances that my son will take after her? I have a theory that body type is passed on from the mother. All the robust alpha studs I've known in my life have had masculine dogs for mothers and beta looking fathers. They took after their mothers, not fathers, so I'm hoping my son will not take after me. The only thing I want him to inherit from me is my high IQ, height, hooded eyes, and big lips. My girlfriend is definitely NOT a dog (her face is beautiful) but she does have a robust physique. She comes from a line of people with solid bone structures. What are my son's chances?