I unfortunately had to give up some friendships when I went sober. Turns out they were less friends and more drinking buddies. Tried hanging out with them after I stopped drinking but they couldn't handle me but drinking. Constantly tried to get me to have a drink. "One won't kill you!" So for my own sobriety I had to move on from them. It tough but proved how serious I was about sobriety. I think you'll have a similar feeling if you start ridding your life of that identity.
Luckily one of my buddies is in a similar situation and we're supporting each other. Makes it easier when someone is holding you accountable.
