You need to get over the "horse is really sweet" mindset. Horse is "sweet" because it suits it at that particular moment to do what is being asked. If it doesn't suit horse? Then you will see the real horse.
Which is what is happening here.
I would say most of this is you. Horse has figured out you don't know what you are doing, how to do it, and can't make horse behave in any way.
You may have caused the bit issues because you banged teeth, or drug bridle through eyes, or hurt ears? Or bridle may not fit period, browband too small, too small period, or bit is.
But your best and safest route is to find someone and take lessons.
Horses make me a better person.