Is (7.7 inches) 19.6 cm better size to have good sex?

I am virgin. I have been in love since 1 year. We are now planning to have sex. I read somewhere, above 7 penis causes problem to a girl. Does my penis fall under big size penis? Because I wish to have sex in missionary position and website claims big penis gives pain to girl in missionary position. Just enlighten me show more I am virgin. I have been in love since 1 year. We are now planning to have sex. I read somewhere, above 7 penis causes problem to a girl. Does my penis fall under big size penis? Because I wish to have sex in missionary position and website claims big penis gives pain to girl in missionary position.
Just enlighten me
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