There was once a lovely girl who went to a very chashuvah seminary (this is going back about fifteen years), who wanted very much to come back to America and attend Queens College, a public institution. She went to her Menaheles, a well-known Mechaneches, who advised her to teach in the morning, and attend classes in the afternoon/evening. The Ruchniyus that her morning teaching in Limudei Kodesh would give her would ground her for the experience. She did so and married a wonderful learning boy and established a chashuvah home.
In the New York area there are wonderful yeshivas for boys who don’t want to compromise their ruchniyus for their career and for whatever reason must attend co-ed college. These Rebbes are doing a wonderful job in guiding the boys and maintaining their learning and Yiddishkeit. Please speak to your Rav or seek out one of these yeshivas. Hatzlocha VeBrocha.