Time cools, time clarifies; no mood can be maintained quite unaltered through the course of hours. When you make a decision to "be" a particular way, you can count on change and external circumstances to come along which will challenge that decision. Remain vigilant after declaring a major decision and manage yourself in relationship to the goal. Set up structures that support you staying on target.
Keep away from people who try to belittle your ambitions. Small people always do that but the really great make you feel that you too can become great. When you are seeking to bring big plans to fruition it is important with whom you regularly associate. Hang out with friends who are like-minded and who are also designing purpose-filled lives. Similarly be that kind of a friend for your friends.