Ask HN: As a young developer, how can I launch a successful freelancing career?

I started learning web development at an early age, and a few years back i started freelancing using the freelancer.com platform. But it's no secret that freelancer.com has bad business values and is basically ripping off all developers, not to mention it's low prices and bad clients. So i'm wandering how can i launch a successful freelancing business while being a college student, without being tide to a platform, since i don't have any experience in doing so, and don't know where to get the clients.