Why are you drinking? What is drinking giving you, that makes it more attractive for you to keep drinking? It costs you loads of money, takes away all your energy and health, is destroying your relationship, is blocking your future (how is school going to work, with all the drinking?). Even though you know all these things and you want it differently, there is something that makes you keep going back to the bottle. What does it for you? What pain are you numbing with drinking, what are you running away from with drinking…?
Do you have an idea about that?

Sorry to hear about your dad. You mention it randomly, between 2 other facts, how is that for you, did you have time to mourn, do you have somebody to support you with that? You sound quite young, since you are talking about going to school, did you have a good relation with your father? It is always hard to lose a parent.

Good that you have gotten in contact with a therapist. I hope it will work between you 2, and give it some time to connect and for the therapy to work, don’t expect miracles too soon.

Are you able to talk with your boyfriend, to tell him how you feel about these destructive habits, and how you want to change them?

You mention 2 good things that you stopped doing: eating healthy and working out. And you are doing more of what is not good for you, drinking.
Can you see a way of changing the balance in that. Maybe by gradually re-introducing the healthy things. For example going for a few good walks each week, going to the gym, joining a sports team, depending what you like. As well as with the food. I have found that for me it doesn’t work to forbid myself to eat anything unhealthy anymore. But it works to focus on eating more healthy. Maybe gradually, maybe start with one healthy meal per day, or adding a salad to one meal per day. Something that seems possible for you and that you wouldn’t quit after one week.. I don’t know. Maybe this is not what works for you, maybe you need to change things drastically for a few weeks, so that you can see the positive impact and that might be a stronger motivater for you. You know yourself best, or maybe not, and then you want to try out ways,to get to know yourself better.

As well as increasing the healthy habits, what kind of things do you like to do, what do you enjoy? Are you doing any of those now? Can you take some steps to take some time each day, to do something you like?

You say you hate who you are. That is a horrible feeling. If you feel that way, it will be very hard, to stay away from drinking, and to be nicer to your boyfriend. You have to love yourself. I don’t think that you really hate yourself, but you hate the person that you are becoming with the destructive habits and behaviors. That is not YOU. The you inside, beyond the drinking and abusing, wants to be happy, wants to be better, that is why you have gotten in touch with a therapist, why you want to go to school, why you want to save your relation, why you are asking for help here.
But you have to feed the real you, the human with beautiful qualities. By doing healthy things, by doing things that make you happy, by doing things that you find important, by showing yourself that you can be good for others as well, that you can relate with others in a positive way.. Don’t just sit there and be disgusted by the persona that is there now with the destructive behaviors. Learn to do things to look after yourself.

I’m also wondering what you can do to restrain yourself from getting abusive to your boyfriend. Because this needs to stop. It is hurting him, driving him further away from you, and it is feeding more into your self-hatred.
Learning to see it coming up BEFORE you get abusive, and stopping yourself, i don’t know. But you write that you get abusive when you drink, do you only do it when you drink?

Hmm, sorry I kept rambling on, and i don’t know if much makes sence.
Well done for writing to the therapist, and for looking for help here, that are already 2 steps you took to make a start for the change. You can congratulate yourself for that.
Good luck, and be welcome to keep writing here, of it helps you.
Be kind to yourself.