I can't give you much of the 'science' but from a females perspective I can offer some advice and points to consider. I've been training for over 5 years and first of all you cannot and will not turn into she-hulk. Trust me! Not knowing anything about your training or diet, it is hard to give you advice but I would suggest you reduce your cardio and focus on building a solid weight training routine with minimal cardio. Also, most likely as a female your diet is not what it should be your probably under eating or not eating a good split,(I'm assuming so if I'm wrong I apologize) I track macros and that works for me but you may find another method works for you. You need to be consuming a well rounded diet with enough calories to sustain a bodybuilding program. Look at your cardio as more of a movement goal, for me personally I use a fit bit and work to get my 10K steps a day, when I want to start increasing cardio I look to get additional steps or add in more intensive cardio sessions. I look at my physique as: #1 Diet, #2 Weights, #3 Cardio