Students usually choose their own major, their preferred area of study. Young adults usually choose who they are going to live with, for the rest of their lives. People in Jesus' day took a similar approach when it came to becoming a disciple - they chose who they were interested in following, or whose disciple they would be. Jesus did something very different. He went out looking for disciples, without waiting for them to come first to him.
What's more, he meets people in the routine ordinariness of life, while repairing fishing gear, working in the tax office, or doing whatever. My own story is similar - I had never given thought to becoming a priest until it was brought to my attention, with my inner response being, "Why not?" I had never dreamed of being a missionary on the other side of the world, until I was invited.
God doesn't just wait on us to follow up on whatever dreams and plans come to mind. No, he's taking the initiative and inviting us to come and work for him and alongside him. We don't have to stay with our narrow vision of what is possible for us to do. We can say, "Yes, I'm coming, Lord," and see what opens up for us. It will likely be more than we ever dreamed of. And we don't have to go far away, we just have to open up to what God is asking us to do here and now.