The title says it all! I know there is a jockey college, but is it necissary to go when there is a large chance you'll be injured and will need a college degree as a "fallback career?" Anyway, how do you become a jockey?
It is not necessary to go to college. You do need to get to a track and get a job. Hopefully you have some horse handling and riding skills, will work the hardest of anyone, and get a chance to start exercising.
If you shine at that, you may get encouraged/sponsored to get your "bug" (apprentice) license. From there, it's up to the horses you manage to get rides on and your skill.
Have you ever galloped race horses or broke any to gallop?
What do you weigh without starving or dieting?
There are a lot of ways to get to the track. The best one is through a trainer or a TB farm. Most of them start their colts at home and hire exercise boys (or girls). The ones with talent and 'feel' and that don't have a problem making weight (5 pounds less for an apprentice bug *) than regular weights and can make allowance weights will be on a fast trip to the track. It is really hard without a known trainer or owner to vouch for you and give you a start.