Masterbation SOS

Ok, so I am almost 20, never had sex(and not really that important to me since I think I may be Ace or Demi???), and I don't believe I've ever successfully gotten myself off on purpose.

Not to mention for reasons I won't go into I need to get someone to drive me to places, so I can't really be able to sneak off to a store that sells sex toys and what not to help me out. Look, I just NEED some advise to properly and safely masterbate or else I may lose it.