We have to make them happen.
The road to reaching our goals will have potholes and bumps, we must expect and anticipate difficulties and disappointments.
To reach our goals we must never give up. We can adjust them and refine them if there were aspects that we find were unrealistic, but we should not turn back just because things are more difficult than we at first anticipated.
Making plans to anticipate and overcome difficulties will make us more prepared for when challenges arise. This way challenges will not come as a surprise and will therefore be less likely to deter us from reaching our goals.