Introversion, and being kinda blunt.
Each to their own, but this isn't necessarily true. It's entirely possible to be happy, if you choose to indulge in the things that make you happy. Got a hobby? Do that. Love your family? Spend time with them. Having a mental illness doesn't necessarily stop one from experiencing/enjoying these sorts of things.
IBS is worse. Now Iunderstand why you think life is wonderful and people who dont think life is wonderful should get therapy :/
Celiac disease and IBS can coexist. I have diarrhea pretty much every day still even though I follow the diet and have no more antibodies.
I've struggled with depression my whole life. Never wanted to die, but I've done my fair share of self-harm. Therapy is a necessity for people like me. Medication too, to a certain degree. I speak from experience.