It is a normal reaction to your first time. Just find a moment of calm to review everything and make sure you have all your documents, passports or other acceptable ID, your Set Sail Pass completed online, etc. It will seem like a whirlwind at the pier but before your senses fully return you'll find yourself deposited on the Grandeur with a goofy smile on your face.
Just remember - those smiling waiters with the trays of welcome aboard special drinks are NOT giving them away!
Let us know how your cruise went, and Bon Voyage!