Well, even if they say they will wipe your record, thats never truly the case. However, if you do a good job, stay out of any and all trouble, you can have a successful adulthood and folks will give you the benefit of the doubt the longer you do a good job, stay out of trouble and the more time that goes by from your teen years. Get in any trouble as an adult though and your pretty much done, nobody will want to take a chance on you. Now, you can kind of get away with it as time goes on because you were a kid when you got your record but if you do anything as an adult, the rest of your record might as well have been done now in your adult years because then it will effect you the same.
Good luck, stay strong (minded) and choose your company wisely. If your noticing a friend, or so called friend you have being a dirt bag, you gotta think about your future and sever ties with that person ASAP for your sake. This may take a kind of strength you may not be used to at this point your life but that's the type of thing you have to do to keep your background clean and fix your official reputation.