What bit do I use for a horse that bolts and is 12?

Now a couple days ago I took my friend out of the corral to teach her a few things. Well, that didn't go as planned apparently my horse decided I want to go home and took off with my friend and made her slam into a tree. Then a couple days later I went out to work him. Changed to a different bit and when I got... show more Now a couple days ago I took my friend out of the corral to teach her a few things. Well, that didn't go as planned apparently my horse decided I want to go home and took off with my friend and made her slam into a tree. Then a couple days later I went out to work him. Changed to a different bit and when I got back on him (Keep in mind I'm only 5 foot and he is like 16.3 hands) before I got my other foot in the stirrup he decides to bolt on me. I don't have spurs but I do have a crop but didn't use it. So he takes off my brother catches him because the reins dropped.
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