Biopsy is the gold standard, so yes you almost certainly have Celiac disease.
My diagnosis happened in a way that is similar to yours. I had an endoscopy because of acid reflux. The doctor saw signs of Celiac in my intestines and took biopsies. My villi were almost completely flattened, but I never had any symptoms. Like you I was a silent Celiac and like you I sometimes question the diagnosis because of my lack of symptoms.
I have been gluten free for over two years. I still have acid reflux. To my knowledge acid reflux isn't a symptom of Celiac disease.
What we really need is more silent Celiacs like yourself to get diagnosed. The more of us that there are the more it will be easier to eat in restaurants and socialize with friends without having to explain your diet.
I can understand how dating would be difficult at your age, but there are plenty of vegans who manage to find partners and I'd think it would be harder to date a vegan then it would be to date a Celiac.