wht i can say is, its u who ll have to prove urself. being an engg student, whr in my btech class, there were only 15% girls in class, and in mtech, 2% girls in class, still profs always gave importance on hard work and intelligence,not on gender.In class, I never faced any difficulty in presenting my views and those were accepted by guys also, without any trouble. i expect the same thing in US also. ur score , GPA, and ur confidence in wht ever u r saying and doing will matter, and nothing else.