Shavuot is the biblical feast the Apostles celebrated when the Holy Spirit was poured out. It marked the giving of the Mosaic Law on Mount Sinai. And it foreshadows that day when God inscribes His Law on our hearts - through His Holy Spirit.
When you messed up or your dreams are shattered - remember: God isn't finished with you yet! God has a plan for your life. He wants to give you a future and a hope.