Wow, sounds like you've got a lot going for you... And 18 is DEFINATELY not too young. I had a guitar duo when I was 16. I've been (and still am) involved in all kinds of projects, even at my toddering age.... One thing I can definately tell you is that you have to know where you're going. I think it was Walt Whitman (an old US president) who said: The world gets out of the way of the man who knows where he's going" (something like that--we, of course, edit to include "woman")
SO, if you don't mind a little advice from me, it comes in the form of questions (all overlap each other):
Do you have a musical concept/direction? If you don't people will come and quickly fade away
Do you know what you want to say? "Cloning" is good for learning, but not original, although it's a good place to start sometimes. But that's not the same as covering other peoples' music which is always a great idea. You can say a lot with other peoples' music, and get lots of support so long as you're not just trying to sound like the original (that's what I mean by cloning)
Do you have a repertoire? Is it cohesive? What I mean is, if you're too ecclectic, people are interested with one song, bored the next...
Most important question: are you going to do it anyway, even if no one is around to help you out? (If this answer is "yes" people will
want to join your project because they have someone who's leading.
As mherbert said, find a music school, guitar store, hang out. Make new friends.
Sounds like you need to meet people who are into it the way you are. If you're really lucky you'll meet musicans who know more than you, and you'll get to learn lots too. When I was younger, I tended to want to be with the hipper kids, and finally, at a party, a "fringe friend", who I thought was a bit of a goof, was playing guitar, I started singing, we sounded good together, he encouraged me to learn to play, and it just went from there. A nice singing duo with 2 guitars. I played nylon, he played one of the original Ovations. Lots of gigs-small ones- I was underage so outside of coffee bars, school functions, park festivals etc., we couldn't do much until I was older. I eventually moved into jazz music and he wasn't into that... The point I'm making here is: gravitate to people who are serious and who play your kind of stuff, no matter how they look, dress, act, fit socially. Don't waste your time on people who just "wannabeastar!" and concern themselves too much with the trappings of a music career. They're mostly destined for the bedroom mirror... It's all about the music. The rest will come to you...
Now that I think about it, the music school idea is the best one. I teach in a MS and a guitar teacher and I are always crossing departmental boundaries. Putting students together for concerts and such. Good for his students and good for mine. Try this idea. You'll definately get connected to serious people. OK. I'm gonna stop now. Hope I haven't bored you, and that it helps, if even a little....
.../gin