>>5 I feel like her 'non-mask' is literally just another mask, adapted for your sake. She did a similar thing to be a while back, just not quite as intense. She's smart enough to figure out a configuration that pleases somebody, just not consistent enough to keep it up.
Also, I think you are trying to distance yourself in completely the wrong ways. It's never going to be easy to do it, but what you are doing is taking all the easy ways out. Getting drunk and involved with other girls are literally some of the worst things you can do. Drunk just plays havoc on depressants and getting with other girls simple reminds you, leashing you back to her. What you need to do is something that may seem unappealing or hard, but better in the long term. Try taking a bit of a break from teenage life, maybe go on hiatus from Facebook for a while, maybe try to focus on work/fitness/school, maybe just actually take a break from alcohol and weed, just something that is actually good and refreshing. I understand it is a lot easier said than done, but it is way better than just getting drunker and sluttier.