First and foremost, make sure your child's hearing is tested. If there's a problem, deal with that.
Your baby/14 month old sounds like a normal, active 14 month old. She wants what she wants. She can't delay gratification (like you can) and be still while being taught. She can't control most of her impulses, and exploring (every part of the room) is one of these things.
The "normal" attention span of a baby that age is a few seconds if they are not interested (redirection to what they are not interested in will result in an even shorter span) to longer if it's something they are interested in.
My firstborn used to put his finger near an outlet and look at me, waiting for my admonition. I guess for him it was like magic; all he had to do was put his finger near an outlet and I would perform! Then he would stick his finger in it even though I was saying no. (This was before outlet covers were available.) My only recourse was to whisk him away to something more interesting.
My advice would be to read about what is and isn't normal behavior for babies, so you know it's not about you and it's not necessarily about her. Knowing that her behavior is normal allows you to approach this as a phase to deal with as opposed to a toddler who needs to be disciplined. Your pediatrician's job is to keep the baby safe and healthy; they should be able to give you copious amounts of literature and some good book recommendations. Know that there are 'quiet' babies, 'active' babies, etc. Yours may be on the more active end of the range.
My feeling is that you can start teaching a child that there are consequences for bad behavior starting at around 2 years of age. It's fine to say "No" and divert the child's attention until then.