Biotechnology is as old as winemaking and animal husbandry, yet as new as recombinant DNA methods.
In the modern context, biotechnology involves the commercial application of many research tools of modern biology as well as engineering principles and methods. Even if you weren't, I'll tell you anyway. I have always enjoyed the sciences and Biology always came easiest to me. I also had the most fun and most positive learning experience in Biology than in other sciences. It was a natural choice for me seeing as though I don't need to take Physics.