Hi and welcome. I've only got 6 months under my belt now but for around a year before this I kept going around in circles never getting more than a month or so of sobriety. For years alcohol was a major 'crutch' for me in social situations because it eased my nerves and made me feel more 'accepted' especially if everyone else was drinking. It wasn't until I avoided all of these social situations completely that I was able to get sober. I realized that what I did for years was going to take a long time to untangle and unlearn. I'm learning new coping techniques and have to be patient with myself. I still avoid a lot of situations that I don't feel comfortable in but I'm getting better.
You made it a year so you know you can do this. Be patient with yourself and don't beat yourself up over this relapse. You can learn from it and move forward. Think about why you took that first drink, (were you nervous or uncomfortable?) and think about how you can avoid that happening again.