When you know, you know
In life you have times when you can see what you want and go after them aggressively. Other times you have visions about your purpose. Either way you should believe in yourself.
So many times we don't think that we're good enough or even capable of achieving some of the things that we want to. I encourage you to pray over what you believe your true purpose is and ask the Lord to guide your path.
It's not always easy to pursue your dreams but it is easy to ask God about that thing that you believe is your calling. He may not answer the way you want him to but pay close attention to the signs.