Why am I scared of my horse?

I ride this horse that bronks badly. SERIOUSLY he's got my instructor off! I'll get on and ride him propperly, but as soon as he bronks it really puts me off and I ride really pathetically. I don't get why I'm scared though because he's never got me off and I know I can sit to him. I ride... show more I ride this horse that bronks badly. SERIOUSLY he's got my instructor off! I'll get on and ride him propperly, but as soon as he bronks it really puts me off and I ride really pathetically.

I don't get why I'm scared though because he's never got me off and I know I can sit to him. I ride naughty horses all the time without a problem. How can I get over my fear and ride him?

Please don't say, 'don't ride him' etc because he's so nice when he doesn't bronk and when I ride him well. It just all goes wrong when he bucks.
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