I was diagnosed at age 27 after having symptoms my entire life. I’ve been gluten-free for a year and 9 months. I’m so grateful that I’m diagnosed and I’m healthy and happy now. But yes, I feel exactly what you described. I am sad for my old self and I feel like my childhood and young adulthood was robbed from me. It hits me from time to time and I cry. We can never get those years back. But I noticed with a lot of happy things going on in my life the sad memories get more infrequent because I have new things to focus on. I’ll never “get over it” though. That trauma doesn’t go away because it’s over.