It is easier to beat yourself up for being a coward than it is to make that assessment and
change your life. If you don't want to take medication, find a therapist (maybe through your current therapist) who will help you with cognitive behavior therapy rather than just throwing pills at you.
If you want to have friends or a family that will trust you, you have to care enough about them and yourself to make an effort to be the person you want to for them. You have to be a good friend to have good friends, you have to show the people you love that you love them for them to really feel it.
Drinking does not make you lovely. Drinking inhibits basic bodily functions, makes you gain weight, ruins the clarity of your skin. Drinking makes people loud, do things they wouldn't otherwise, and alienates them. Drinking kills you from the inside, shutting down your organs and slowing down your brain.
Do you feel listened to by your therapist or by those around you? If not, speak louder, don't drown yourself out with booze. If you're hurting, try to express it. The saddest part about your post to me is the level of articulation and self-awareness you have. You have such potential! Seek that potential, work for it. You deserve better for yourself. Go into rehba again, go to meetings once you get out. Make friends of caliber, not just party friends who laugh at your antics and give you meaningless sex when you're wasted.
That's the thing, we call being drunk being
wasted. How much of your life do you want to waste on this?