Is this binging? How do I stop?

Ultimately, you have to solve this for yourself, because only you know what makes you tick. I'll list a couple of approaches, and maybe one of them will make sense to you.

Try to note all the times you can remember binging when you weren't hungry. Who were you with, what time of day, what kind of place, what was the occasion, what you were wearing and so forth. How did you feel about the people you were with? Before you began eating, were you feeling shy, annoyed, happy, anxious, relieved? Did you feel like you were connecting with the other people there, or were you focused on the food instead of the people? The more you can realize about yourself the better.

Once you figure out: "I'm a celebratory eater" or "I'm a social anxiety eater" or "I'm a rebellious eater" or whatever, then you can make a plan to overcome it.

Personally, when I feel tempted to overeat in a social setting, I have to excuse myself, go somewhere quiet and do some deep breathing. I say things to myself like, "This is not your last opportunity to eat chips." or "You're here to connect with people not food." "What you do right now matters." "You are calm, strong and in control." etc... Figure out your own mottos or mantras and actually use them when the pressure is on. Start a journal where you write down how you avoided binges, or what you learned about yourself when you didn't avoid one.

On the other hand, instead of being emotionally/socially driven, your binging could be biologically driven. If you are sensitive to blood sugar spikes and drops, you can suffer from more temptation than the average person. Lots of people find that when they lower their carb intake, they crave less, and when they stop eating sweets, breads and pasta, they naturally stop binging. This goes against the conventional wisdom that says "don't restrict too much or you will feel deprived and binge." You may want to experiment with low carb to see if this way of eating will help you avoid binging.

Lots of luck!