I don't know if it's a fight, though early on dealing with cravings, and undesirable thoughts and feelings is a real thing and can feel like a fight
Getting sober was a process of building new boundaries in my own head. From the rational recovery perspective, it's separating the undesirable addiction and addictive thoughts from the you that you want to be. Change can happen the second you decide to make the change, but it can also take time to reinforce your own goals and figure out exactly what you need to do. The "fight" fades with time along with old habits because you've learned and practice healthier and more effective coping mechanisms
Sending my support!