There are many people who are on the same rung of the ladder like you at the this moment. There are also many who are on a far lower rung than you. But they will be right at the top of the ladder in a few years.
What about you? Where shall you be at that time?
If they can, why can’t you? You can even if it looks impossible to you now.
Take note that it is not only to you that it looks impossible to get to the topmost rung of the ladder. It looks impossible also to many of those who will get to that topmost position. But they are not focusing on the the fact that it looks impossible. They are focusing on their belief that they will get there.
That is what you should do. Focus on your strengths and possibilities not on your weaknesses and impossibilities; and keep on going. You will arrive.