Welcome to the Forum Saturn!!
Don't let your own life pass you by as a result of someone else's addiction, and that includes a family member, why should alcohol be allowed to take away 2 lives, and 2 potentials, that was the biggest lesson I learnt from dealing with my dad.
Sure someone may change, but what if they don't? go out and live your life, meet those friends, get that job, that driving licence, start living life on YOUR terms, and not in the shadow of your mum's drinking, make the first few steps towards moving and then the rest of life will fall into place.
You'll find loads of support here on SR!!
