Im not 100% sure if I was hungry or not though, at the time I wasn’t sure if it was overeating because I thought that was eating a lot of food, I’ve just been to Confession do I need to go back?
No, you don’t need to go back to Confession. It definitely isn’t mortal sin because mortal sin requires full knowledge. If it is bothering you, talk to your priest next time, he knows more than me.
I can’t judge the situation fully because I wasn’t there. Praying will be the best way to deal with it. Here is what St. Thomas Aquinas says about the types of gluttony:
In his Summa Theologica (Part 2-2, Question 148, Article 4), St. Thomas Aquinas reiterated the list of five ways to commit gluttony:
Laute - eating food that is too luxurious, exotic, or costly
Nimis - eating food that is excessive in quantity
Studiose - eating food that is too daintily or elaborately prepared
Praepropere - eating too soon, or at an inappropriate time
Ardenter - eating too eagerly.
And a quote from St. Alphonsus Liguori,
“Pope Innocent XI has condemned the proposition which asserts that it is not a sin to eat or to drink from the sole motive of satisfying the palate. However, it is not a fault to feel pleasure in eating: for it is, generally speaking, impossible to eat without experiencing the delight which food naturally produces. But it is a defect to eat, like beasts, through the sole motive of sensual gratification, and without any reasonable object. Hence, the most delicious meats may be eaten without sin, if the motive be good and worthy of a rational creature; and, in taking the coarsest food through attachment to pleasure, there may be a fault.”