Nursing is a 2nd career for me (although I have 10 months left til I graduate) & I've thought about this too, if nursing doesn't pan out, I'd either go to law school or get my Masters in Biotech (after I take some more sciences classes) and work in a research lab. Maybe you can look at one of those fields.
My first "career" didn't thrill me to pieces either so please don't feel badly!! You gave it your all!!