You are young. And yes, your lack of on-stage experience highlighted your nervousness while performing on TV for millions and millions of people. For the inexplicable and often illogical voting audience, that shaky inexperience did not endear you.
Pity. Because you have a unique and wonderful voice, and a talent that is undeniable even under the burden of stage fright. Please don't allow last week's vote to alter your musical career path. We need musicians like you. If you don't come back to AI next year, then please keep pursuing the path through other means. I look forward to someday having in my music library the musical stylings of Alex Lambert.
P.S. Your talent is spot-on, but that hairstyle must go. Either grow it all long or cut it all off. The half-and-half baby mullet ain't workin'. :-)