I've never gotten that impression myself, though like you I am a teenager. When I have wanted to dislike Mozart because it was a "stereotypical type of classical music" to listen to, I still could never resist him. I've had that problem with Bach certainly, but never Mozart. There is something magical about him and I don't know what it is, his music is so clear and there never seems to be a wrong note, and in my opinion it is completely alive. To me you don't sound ignorant or naive, as I am not frustrated with your "lack of sophistication"(however some silly people might put it) in terms of appreciation, but rather baffled at how Mozart doesn't still sound completely fresh to people because I have found his music completely and utterly timeless, even when I have wanted to dislike it. There are certain works of Mozart that are easy to write off in the way that you describe; his piano sonatas are often not as complex seeming as later works, often but not always, but his masterpiece symphonies, operas, string quartets, and above all else, late piano concertos seem completely timeless to me in a way that few other than Beethoven can match.
In fact, to my ears that were accustomed to The Beatles, The Who, and Led Zeppelin for the longest time found Mozart considerably more appealing than Beethoven, who I found long winded and clumsy at first, but with the help of his Mozart sounding works like the 6th symphony, I got him and now love him. Like I said, there is something magical and alive about him in many of his works so that you can't miss it.
Also, I consider Tchaikovsky and Mozart similar in that they have a similar instantaneous appeal because they are both so wonderful with melodies, so alive in the most visible respects, so "colorful", though the differences are many. What Mozart pieces have you listened too? I don't mean to tell you that I think you are wrong or that your viewpoint is illegitimate, its just that my perspective on Mozart is so different I am both fascinated and perplexed because it seems to me the opposite of the way I viewed him, not wanting to like him due to his popularity but finding him impossible to resist.
If I had to show one Mozart piece that is extremely inspiring to me...I don't know if I could pick so here are a few of my favorites.
Piano sonata in b flat finale played by Gulda(great Mozart interpreter among other things)
http://www.youtube.com/watch?v=jUuT_z1p8O4&feature=related
"Dissonance" quartet, first movement
http://www.youtube.com/watch?v=mjZylz3nCwQ
C minor fantasy by Gulda(if this doesn't amaze you man...)
http://www.youtube.com/watch?v=Yjjdee0B960
http://www.youtube.com/watch?v=AXMEkzYjjuY&feature=related
Mozart Symphony 40 finale
http://www.youtube.com/watch?v=uJHYnBl-DJQ
Edit: Great Selections from Del, and funny that we both ended with the symphony 40 finale.