ANSWER:
When scholars say that studying in a mixed school is prohibited, it is for this reason as such environment of free mixing and socializing weakens a person’s Iman and hardens their hearts.
You have a choice between following the footsteps of the prophet salla allahu alalihi wa sallam and his companions when they stood against their societies norm and evil or to join the sinners and hypocrites.
To “fit in” would surely make you one of them and would qualify you to enter hell. All girls have curves and flesh they can expose as it doesn’t take much effort to do that! Few only can abide by the real hijab and resist the temptation of blending in with the rest of the crowd. This is why the price of paradise is expensive and only few are fortunate to enter it.
The choice is yours!