I recommend reading the stickies at the top of this forum, there's a lot of very useful information there - especially the 13 characteristics sticky. That's a good place to start.
You are not alone, but you are rare - you recognize that you may head down the same path as your mum and you don't want to. Most of the children who grow up in households like ours continue to perpetuate the cycle.
If there is an AlAnon group near where you live, you may want to check it out and see if it works for you. If not, you may want to look into therapy if you can, preferably a therapist who knows about the issues of ACoAs.
And we're always here for you.