Your job as a student is not to close doors. Failing at biology limits your fields of employment. I was a history major but that didn't help me as a weapons officer, recruiter, and propulsion engineer in the Navy, but it did let me get a teacher certification. My background as a computer science major allowed me to teach math. My teaching certification and BA allowed me to use my GI Bill benefits (which was optional for me) to get my Master's degree and promotion to administration. After I retired from teaching, my recruiting experience went from getting hired to the third person from the top in the government contractor for the Army in 8 months.
I never closed a door, which is what you apparently did,
Ever hear the expression, "When one door closes, another one opens"? That is so very true, but other than that it makes for a lousy used car!