Your life will take you in all sorts of directions, and you will learn along the way. No one knows what they are doing in the beginning, well, maybe some think they do, but they discover they don’t.
You also don’t have to achieve great success by the time you are 25. What are you going to do for the rest of the time, because retirement at that age is pretty boring. And there won’t be just one mountain to climb, and there will be many more mountains. The climbing bit, that’s where all the fun is had. The destination is just a flag in the ground, which you will keep moving.