Hello
I've experienced the same thing. I'm 21 and spent years in college drinking and passing out almost every night, couldn't function, and my grades started to suffer tremendously. I isolated myself from my friends and family, couldn't eat. I would spend my days on campus feeling the worthlessness and shame that comes along with being drunk continuously.
The most important thing for me is to find pride in the fact that I am becoming sober. I found pride in the fact that I was making progress. progress in sobriety itself is STILL progress in life, and something to pat yourself on the back for. I envisioned the things in the future, the places I will go, the happiness and self-worth I will experience, when my mind is clean of the poison. I tried to envision that one day, I will succeed, look back, and be proud of myself for making it through the struggle and was still able to achieve my dreams.