This puzzles me...

So I talk to my friends sometimes about what I've been doing with my "band mates" in terms of playing and whatnot, and I have told them about how I'm entering the talent show for my guitar playing, but they still don't really register that I actually play. I don't know if they just assume that when I say "play" I mean "Own an acoustic guitar and sing mediocre songs from the radio" or what, but today in school I showed one of my friends an mp3 of the cover we are working on, and she said "Is that really you guys playing?" and there was another track where I did all the instruments except vocals, and she again, asked "Is that really you?". It's pretty much like "Well, duh, its me, what have I been talking about all along?" I want to go to music school, but nobody takes it serious when you tell them you are actually good at something. Even my mom was really suprised when she heard me playing on the mp3. It's like, Come ON! I've only been playing guitar in my room with the amp too loud for five years now, and you finally catch on because I'm playing a well known song that really isn't hard in the first place? I just don't get it. I'm doing the talent show, not for recognition or anything, but because the PRINCIPAL (yes, principal of the school) signed us up for it because she heard our project where we recorded some crappy ramones and black sabbath covers with some historical lyrics. So now I'm gonna be playing "Paranoid" for all to hear. Whoopee, and first prize is a 75 dollar Wal Mart gift card, yay, it's what I always wanted. *cough*sarcasm*cough*cough*