God, at 18—or hell, at 22—showing the fuck up and not seeming entirely incompetent is a big deal. Show up, be engaged, do both consistently, and anyone who's not a total piece of crap will be all over giving you more responsibility and mentoring you up to bigger and better things. Total pieces of crap may still be interested, but it'll be in exploiting you (as in current situation). Oh, and ask questions. No one expects you to know diddly-squat, so ask away. Ask about stuff that's not part of your job description at all. People will tell you all kinds of stuff, and, incredibly, the whole exchange will make them like you more.

Phenomenally small amounts of give-a-shit go a long way for youngsters. It's basically their superpower, if they're willing and able to use it.