Don't listen to the mainstream tools who appear to be here only to put down any alternative to mainstream medicine. Since this is the "alternative medicine" section, one has to wonder what their agenda is, huh?
The reason herbs are not used in hospitals is because you cannot patent nature. That is why the patented medicines we see are either unnatural compounds, synthetic versions of natural compounds, or unnatural isolates without the supporting compounds found in nature.
If one only stops and thinks for even a slight moment, they would realize the absurdity of anyone trying to claim that mainstream patented drugs are superior to natural alternatives in every single instance. Impossible! Yet that is the bullcrap they try to sell us.
Do you watch much TV or read much? How many times a day do you see healthy looking actors telling you to "Just Ask Your Doctor"? Do you happen to note all the warnings about side effects? That is because over 95% of all approved medications have side effects. Many of those side effects can be quite serious and even fatal. Often they lead to other conditions requiring still more medications with still more side effects. It becomes a never ending cycle so that by the time you reach 65 or so, you may be taking 15 or more prescribed and over the counter medications. And it all started with one or two conditions which could have been prevented or successfully treated with nature.
That is a great model for profit, especially when your only marketplace is the human body, but it is a horrible one for healing and humanity.
Your idea of becoming an herbalist is an admirable one, though it may be a tough go. I would advise looking around for a master herbalist who would be willing to take on an apprentice as an excellent way to get hands on training, as well as getting their own advice on becoming educated about herbs.
I wish you all the best.
I am a natural health author, advocate and researcher.