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It's definitely never too late! Find a mentor and work on a game plan on what steps you can take going forward! good luck!
First of all maybe biology wasn't really the perfect major for you. The good news it's not to late to do something about it. My wife got a Bachelors degree in communications. But as her life unfolded she decided to go back and get a business degree. And as her life further unfolded she went back and got a MBA in healthcare. My point is sometimes your life takes a right when you thought it would take a left.
You have several options. First you can get involved more in the library as a career. There are degrees offered for library science. A very rewarding career.
Second there is nursing. You stated you are having issues with nursing school. Baby steps first. Try a two year college that offers nursing degrees. You can work as a nurse with a two year degree. You can also use that degree to get into a four year nursing program. With your biology degree and your two year degree you should be able to get a BSN very quickly.
Thirdly you can use the free time your library job alots you to investigate totally different careers.