There are very many ways to lead. Some in front of the people, and others behind. Many gifted people are introverted and as such don't find it easy to be in front of the crowd, so you aren't alone in that sense. You can very well be gifted even if you don't prefer outright leadership. You just do what you can from where you are now.
You can find out if you're gifted in different ways. The most common one is to take an IQ test. If you test above 130 (on most tests) then you're likely gifted. There are some people who, for various reasons, are gifted yet don't score above 130 though, so even that isn't foolproof. Finding yourself in the list of gifted characteristics is another unofficial way. If you see yourself in very many of the things on the list, you could be gifted.
There isn't a perfect answer. For now, follow where your inner sense tells you to go and see where you end up (as long as it isn't over a cliff or something as life-threatening).