Being Tony is suffering, all things considered. Imean, what does he have going for him that others don't? Reed has his own company, is smarter, and goes on sci-fi adventures with his family every day. T'Challa makes all females wet, is richer, has a country and is just as smart,and a polymath. Pym is light years ahead of Tony. DOOM is DOOM.
Sure, he has it better than the average joe,but in the Super-Hero world, he's really fucking low on the food chain. I guess that's why he's so insecure.