I have Confidence in Me

My hometeacher from last year came to visit me yesterday. He told me something that kind of took me aback. He said that I had more confidence then last year, that I seemed more sure of myself. What made me more confident? I don't remember any big event that made me change, so maybe it is a million tiny moments. Will I continue to change? What will I be like next year, in five years, or in ten years? I know that change is inevitable but sometimes it scares me.