Well a lot of these guys, who know a lot more than me have said probably a lot better stuff, and i'm only 16, but have been playing for around 5 years now (around 3 and a half to 4 seriously), and have gigged with a lot of bands, now some of the best bands I have played with, have been, individually, fairly average, but sound awesome!
As everyone else says, being in a band IS the best thing, as the main thing is, however much you love guitar now, you'll love it even more! and you'll get more influenced, and you will just keep on improving. Despite my age, I have been in a few bands, (one fairly successful one), and i've seen an audition once, and a guy came in, and tried to play some incredibly hard sweeping/tapping combination covering the whole guitar, and it just sounded terrible! The guy that got the place came in, played something he knew really well, made it sound tight, and made it sound good.
If you see a band you fancy joining, perhaps go to a gig of theres (if they are gigging), or if not, drop them a note, asking what covers they play/want to play, depending on how established they are, and learn one or two of them well, and see how it goes, because they will never say "play me arpeggios from hell, by Yngwie Malmsteen" or anything like that, so IMO, confidence is the key, and I know it's hard, as I was never confident at all, but once you've played live a few times, the surge is awesome! :D
lol, sorry about my really long message, and it's probably useless anyway, but ah well. And i'm sure you're probably ready, even without ever hearing you, as long as you can play a few songs well, you'll be fine :)