The first time I rode I almost got trampled. And I wasn't even on the horse yet. I was out in the paddock with my instructor to get my pony and a temperamental stallion kept following me around. My instructor just told me to ignore him. He wasn't too pleased about that. He reared up, knocking me in the back with his knees as he came up, and I fell to the ground. I rolled out just in time or he would have landed on me.
And guess what? I still got on. I had a fantastic ride. I was probably less freaked out than I should have been, but then again I've never been too scared of horses. All the same I got on and had a great ride. The second time I rode the horse took off cantering with me. I could hardly steer my horse in a circle and he was cantering at what I presumed to be the speed of light. I was 10. But I didn't get freaked out and refuse to get back on. Instead, my mindset afterward became 'okay, so I don't know how to do this. Better learn how, then!' After all, regardless of what you'd like to believe the rider still is the one who controls the horse.
My point is that things happen. Riding horses is a dangerous sport. Horses do have a mind of their own. They sometimes take off, they buck, they kick, they refuse, they spook. If you ride you're going to bite the dust sometimes and you're going to have to learn how to deal with all types of horses. The place you rode at probably wasn't too professional but why let that ruin it for you? And why blame your dad? He's right, you do have to control the horse.
Good for you for deciding to take lessons. But remember, (and this is VERY important to remember) horses are not robots. When you get on, you accept the risks. That's how it works. And yes, you are expected to learn how to control a 1200 lb animal. You may not be perfect at riding at first, but if you're willing to learn that's what matters. It's a package deal. Don't expect to get on a horse that can read your mind and do everything you want him to.
-----In riding horses, we borrow freedom-----