Leaders are born, not made. While it's correct that some people are born leaders, some leaders are born within the midst of adversity. Often, simply those that haven't had a leadership role will arise and take the lead when a situation they care about requires it. An easy example is parenting. When a toddler arrives, many parents discover leadership abilities they never knew existed to guide and protect their offspring.
Once you learn the techniques of true Leaders & Influences, you'll be able to build the boldness it takes to require the lead. The more and more experience you have acting as a real leader, the better it'll be for you. It's never easy to require the lead, as you may make decisions and face challenges, but it can become natural and rewarding.