When Kevin Kim dropped out of college at 21 to become an entrepreneur, it seemed like a huge gamble. “My mum cried a little,” Kim, now 33, said with a laugh. But his confidence was not unfounded. Kim had just sold his first company — which he started when he was just 18 — for “six figures.” That was no small feat, given that his starting capital was just $2,000, which Kim said he saved up from doing part-time jobs.His e-commerce company imported streetwear from South Korea and sold it all over North America, he told CNBC Make It. Achieving product-market fit is really hard, it takes years. You need to ask yourself … Do I really like this industry? Can I see myself build around this for 10 years?Kevin KimCo-founder and CE …