first of all, I would suggest that you really ponder what death would bring, and the answer is probably nothing. it would bring eternal nothing which is nothing good, nothing happy, nothing better than being avoidant.
"death solves nothing because you won't be there to see the solution" - that's kind of my motto when it comes to suicide... and I'm also 18 years old and avoidant... if you really convince yourself that hopefully you'll be fine. I know it seems hard to enjoy your life at times, but it's way better hanging around than taking the plunge into uncharted waters... maybe you can also try to use religion to help you through. as long as you can somehow get fear some kind of hell, it can only help you resist the urge... one of my friends was saved by that so it cant' be too bad...
think about what can happen in your life though... all the possibilities. they say your personality isn't even fully developed yet... you don't even have to be avoidant your whole life, get all the professional help you can now, it may not be like your avoidant self, but if you don't want to stay like that, it's what you need... I think you can pull through and even jump off the avoidant bus... remember that there's people who care about you
Lost in the ocean. There's no way out.