A dream is just a dream. A goal is a dream with a plan and a deadline, Harvey MacKay.
A goal without a plan is just wishful thinking, a dream without anything to back it up (almost) never produce results. Dreams are only dreams till plans are made to make them a reality. Then, hard work and perseverance is the only way to achieve them!, Anawim.
It is very important for you to set goals. However, if you fail to achieve them, they could become a stumbling stone rather than a stepping stone.
If you fail to achieve your goals, please consider the following ideas:
If there’s one thing that’s certain in life, it’s uncertainty. The only thing that is constant is change. Embrace them! - Anawim.
Moreover, goals should be:
If the milestone is so difficult to achieve that becomes impossible, you will increase your frustration and will reduce your self-esteem. It is essential to find the middle ground: an intermediate goal should challenge you but, bearing in mind, what is within your abilities, willpower, and limitations; it should neither be too difficult to avoid getting stressed out or frustrated, and therefore, giving up, nor too easy to cause boredom.
However, if you are in doubt, it is far better to set achievable and realistic milestones, and then, little by little, as you increase your confidence, improve your physical performance with constant practice, you can challenge yourself with more difficult goals.