Purpose, focus and simple life.
In this life a lot of people want to achieve certain things in one way or another and mostly these are the young ones; the youth, for they want mark their territories or even build their legacy. This is a good thing but this is tackled in a certain way or procedure. 
Most of these things that they want to do often start as dreams, and you hear people mostly talk about chasing dreams which might be breathtaking because a dream is a very huge thing, so here is my advice on how to go about it;
First of all these dreams are subdivided into small that are achieved on a weekly or monthly basis which can also be subdivided into daily tasks,and remember to always set deadlines.
Secondly one needs to focus on these goals because where your focus is, you invest your energy.
Then, one needs to simplify his/her life because as science tells us energy can’t be destroyed nor created; it can only be transformed from one form to another and once you spend your energy on less important things other than your goals and important people in your life, you will waste your energy and be exhausted which leads to not accomplishing your tasks which will lead to failure to achieve your goals and so on.
Sometimes an individual may have all it takes to achieve his/her goals but without a clear road map, (s)he may find it hard to achieve his/her dreams.
To conclude, if you’re finding it hard to achieve your dreams try this method; having a purpose (dreams), focus on them and then simplify your life.